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</header> <main id="main"> <ul id="breadcrumb"> <li><a href="/">Home</a> <span class="divider">/</span></li> <li><a href="/category/">Categories</a> <span class="divider">/</span></li> <li> <a href="/category/geochemistry-mineralogy-petrology-volcanology/">Geochemistry, Mineralogy, Petrology & Volcanology</a> <span class="divider">(976 entries)</span> </li> <li class="pull-right"><span class="divider"></span> <a title="Subscribe to newest Geochemistry, Mineralogy, Petrology & Volcanology images RSS feed" href="/category/geochemistry-mineralogy-petrology-volcanology/rss/"><i class="fas fa-rss"></i></a></li> <li class="pull-right"> <form id="orderbyform" method="GET" action="."> <select class="form-control input-xs" id="orderby" name="orderby"> <option selected="selected" value="0">newest</option> <option value="1">file size</option> <option value="2">most liked</option> <option value="3">most viewed</option> <option value="4">most commented</option> <option value="5">images only</option> <option value="6">videos only</option> </select> </form> </li> </ul> <div id="content"> <section id="gallery"> <div id="gallery-flex" class="flex"> <a href="/view/18818/" title="Tatun Volcano Group, Northern Taiwan" data-hx-indicator=".spinner-2" data-hx-get="?page=2" data-hx-trigger="intersect once" data-hx-sync=".spinner-2:drop" data-hx-target=".spinner-2" data-hx-swap="outerHTML"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/27/18818.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/27/18818.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/27/18818.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/27/18818.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/27/18818.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/27/18818.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/27/18818.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Tatun Volcano Group, Northern Taiwan" style="color:#2B303700;background-color:#2B303733;"> </picture> <figcaption class="hidden-xs"> <span>Tatun Volcano Group, Northern Taiwan</span> <small>by ThiLan Chi Nguyen</small> </figcaption> </figure> </a> <a href="/view/18804/" title="Calcite Crystals Occurred in the Pb/Zn Ores Depositional Environment as a result of the Hydrothermal Activity"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18804.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18804.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18804.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18804.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18804.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18804.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18804.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Calcite Crystals Occurred in the Pb/Zn Ores Depositional Environment as a result of the Hydrothermal Activity" style="color:#725C5200;background-color:#725C5233;"> </picture> <figcaption class="hidden-xs"> <span>Calcite Crystals Occurred in the Pb/Zn Ores Depositional Environment as a result of the Hydrothermal Activity</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18803/" title="Needles-like Calcite Crystals with Pb/Zn Ores Occurrence"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18803.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18803.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18803.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18803.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18803.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18803.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18803.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Needles-like Calcite Crystals with Pb/Zn Ores Occurrence" style="color:#826E6100;background-color:#826E6133;"> </picture> <figcaption class="hidden-xs"> <span>Needles-like Calcite Crystals with Pb/Zn Ores Occurrence</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18802/" title="Needles-like Calcite Crystals within Limegrits in a region of Pb/Zn Ores Occurrence"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18802.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18802.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18802.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18802.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18802.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18802.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18802.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Needles-like Calcite Crystals within Limegrits in a region of Pb/Zn Ores Occurrence" style="color:#A4846C00;background-color:#A4846C33;"> </picture> <figcaption class="hidden-xs"> <span>Needles-like Calcite Crystals within Limegrits in a region of Pb/Zn Ores Occurrence</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18796/" title="Volcanoes and glaciers"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18796.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18796.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18796.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18796.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18796.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18796.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/24/18796.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Volcanoes and glaciers" style="color:#2E496100;background-color:#2E496133;"> </picture> <figcaption class="hidden-xs"> <span>Volcanoes and glaciers</span> <small>by Rodrigo Balaguer-Romano</small> </figcaption> </figure> </a> <a href="/view/18792/" title="The Great Cone, Vesuvius."> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/21/18792.1.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/21/18792.1.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/21/18792.1.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/21/18792.1.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/21/18792.1.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/21/18792.1.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/21/18792.1.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="The Great Cone, Vesuvius." style="color:#9D888500;background-color:#9D888533;"> </picture> <i class="video fas fa-circle-play"></i> <figcaption class="hidden-xs"> <span>The Great Cone, Vesuvius.</span> <small>by Vishnu Kaiprath Nambiar</small> </figcaption> </figure> </a> <a href="/view/18786/" title="Gypsum Mineral Sample"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/20/18786.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/20/18786.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/20/18786.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/20/18786.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/20/18786.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/20/18786.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/20/18786.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Gypsum Mineral Sample" style="color:#BCBCC700;background-color:#BCBCC733;"> </picture> <figcaption class="hidden-xs"> <span>Gypsum Mineral Sample</span> <small>by Ahmed Mohy</small> </figcaption> </figure> </a> <a href="/view/18773/" title="Outcrop of Calcite/Gypsum Full-growth Crystals"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/19/18773.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/19/18773.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/19/18773.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/19/18773.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/19/18773.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/19/18773.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/19/18773.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Outcrop of Calcite/Gypsum Full-growth Crystals" style="color:#8D8B8700;background-color:#8D8B8733;"> </picture> <figcaption class="hidden-xs"> <span>Outcrop of Calcite/Gypsum Full-growth Crystals</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18772/" title="Outcrop of Desert Varnish"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18772.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18772.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18772.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18772.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18772.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18772.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18772.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Outcrop of Desert Varnish" style="color:#7E706000;background-color:#7E706033;"> </picture> <figcaption class="hidden-xs"> <span>Outcrop of Desert Varnish</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18771/" title="DESERT BOULDERS (due to weathering processes in the region)"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18771.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18771.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18771.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18771.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18771.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18771.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/18/18771.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="DESERT BOULDERS (due to weathering processes in the region)" style="color:#9E988C00;background-color:#9E988C33;"> </picture> <figcaption class="hidden-xs"> <span>DESERT BOULDERS (due to weathering processes in the region)</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18770/" title="Outcrop of S-shaped Stretching occurred in a layer of highly altered Limegrits"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/16/18770.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/16/18770.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/16/18770.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/16/18770.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/16/18770.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/16/18770.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/16/18770.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Outcrop of S-shaped Stretching occurred in a layer of highly altered Limegrits" style="color:#D3AB7A00;background-color:#D3AB7A33;"> </picture> <figcaption class="hidden-xs"> <span>Outcrop of S-shaped Stretching occurred in a layer of highly altered Limegrits</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18737/" title="Outcrop of Calcite/Gypsum Deposits with Siltstone, Kaolinite, and Fanglomerates of the Red Sea Facies (EGYPT)"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/15/18737.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/15/18737.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/15/18737.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/15/18737.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/15/18737.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/15/18737.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/15/18737.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Outcrop of Calcite/Gypsum Deposits with Siltstone, Kaolinite, and Fanglomerates of the Red Sea Facies (EGYPT)" style="color:#6B6B6200;background-color:#6B6B6233;"> </picture> <figcaption class="hidden-xs"> <span>Outcrop of Calcite/Gypsum Deposits with Siltstone, Kaolinite, and Fanglomerates of the Red Sea Facies (EGYPT)</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18731/" title="Needles-like Altered Gypsum Crystals within Lime and Sands Deposits"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/13/18731.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/13/18731.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/13/18731.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/13/18731.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/13/18731.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/13/18731.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/13/18731.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Needles-like Altered Gypsum Crystals within Lime and Sands Deposits" style="color:#8D7E7100;background-color:#8D7E7133;"> </picture> <figcaption class="hidden-xs"> <span>Needles-like Altered Gypsum Crystals within Lime and Sands Deposits</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18728/" title="Mud Cracks Outcrop in Arid Area, Red Sea Coast, Egypt"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18728.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18728.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18728.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18728.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18728.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18728.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18728.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Mud Cracks Outcrop in Arid Area, Red Sea Coast, Egypt" style="color:#B9AEA800;background-color:#B9AEA833;"> </picture> <figcaption class="hidden-xs"> <span>Mud Cracks Outcrop in Arid Area, Red Sea Coast, Egypt</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18726/" title="Well-sorted Marine Clastics (medium- to coarse-sized) embedded within iron-oxides cement"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18726.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18726.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18726.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18726.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18726.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18726.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/12/18726.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Well-sorted Marine Clastics (medium- to coarse-sized) embedded within iron-oxides cement" style="color:#947B5900;background-color:#947B5933;"> </picture> <figcaption class="hidden-xs"> <span>Well-sorted Marine Clastics (medium- to coarse-sized) embedded within iron-oxides cement</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18721/" title="Cupper extraction from a local mine, Iran"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18721.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18721.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18721.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18721.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18721.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18721.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18721.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Cupper extraction from a local mine, Iran" style="color:#7A6B5B00;background-color:#7A6B5B33;"> </picture> <figcaption class="hidden-xs"> <span>Cupper extraction from a local mine, Iran</span> <small>by Mohammad Goudarzi</small> </figcaption> </figure> </a> <a href="/view/18718/" title="Epidote as a Semi-gemstone occurred within Lead/Zinc Ores and Iron Oxides Deposits"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18718.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18718.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18718.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18718.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18718.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18718.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18718.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Epidote as a Semi-gemstone occurred within Lead/Zinc Ores and Iron Oxides Deposits" style="color:#968E8400;background-color:#968E8433;"> </picture> <figcaption class="hidden-xs"> <span>Epidote as a Semi-gemstone occurred within Lead/Zinc Ores and Iron Oxides Deposits</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18717/" title="Galena Ore (PbS) surrounded by Zincite Ores (Zinc Oxides, ZnO) and Iron Oxides (Hematite, Magnetite, Goethite)"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18717.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18717.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18717.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18717.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18717.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18717.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18717.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Galena Ore (PbS) surrounded by Zincite Ores (Zinc Oxides, ZnO) and Iron Oxides (Hematite, Magnetite, Goethite)" style="color:#72625400;background-color:#72625433;"> </picture> <figcaption class="hidden-xs"> <span>Galena Ore (PbS) surrounded by Zincite Ores (Zinc Oxides, ZnO) and Iron Oxides (Hematite, Magnetite, Goethite)</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18716/" title="Epidote Occurrence within Lead/Zinc Ore Deposits"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18716.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18716.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18716.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18716.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18716.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18716.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18716.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Epidote Occurrence within Lead/Zinc Ore Deposits" style="color:#8A827300;background-color:#8A827333;"> </picture> <figcaption class="hidden-xs"> <span>Epidote Occurrence within Lead/Zinc Ore Deposits</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18715/" title="Lead/Zinc Ore Deposits surrounded by Iron Oxides Deposits (Hematite, Magnetite & Goethite) with Calcite/Gypsum"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18715.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18715.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18715.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18715.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18715.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18715.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18715.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Lead/Zinc Ore Deposits surrounded by Iron Oxides Deposits (Hematite, Magnetite & Goethite) with Calcite/Gypsum" style="color:#897C6F00;background-color:#897C6F33;"> </picture> <figcaption class="hidden-xs"> <span>Lead/Zinc Ore Deposits surrounded by Iron Oxides Deposits (Hematite, Magnetite & Goethite) with Calcite/Gypsum</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18714/" title="Gypsum Slice embedded in Lead/Zinc Ores Layer"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18714.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18714.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18714.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18714.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18714.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18714.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/11/18714.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Gypsum Slice embedded in Lead/Zinc Ores Layer" style="color:#B18A6800;background-color:#B18A6833;"> </picture> <figcaption class="hidden-xs"> <span>Gypsum Slice embedded in Lead/Zinc Ores Layer</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18713/" title="Siliceous Stone with Calcite (CaCO3) & Gypsum (CaSO4.2H2O) Deposits"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18713.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18713.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18713.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18713.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18713.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18713.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18713.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Siliceous Stone with Calcite (CaCO3) & Gypsum (CaSO4.2H2O) Deposits" style="color:#765C4600;background-color:#765C4633;"> </picture> <figcaption class="hidden-xs"> <span>Siliceous Stone with Calcite (CaCO3) & Gypsum (CaSO4.2H2O) Deposits</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18712/" title="Growth of Calcite (CaCO3) & Gypsum (CaSO4.2H2O) on Lead/Zinc Ore Deposits"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18712.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18712.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18712.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18712.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18712.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18712.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18712.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Growth of Calcite (CaCO3) & Gypsum (CaSO4.2H2O) on Lead/Zinc Ore Deposits" style="color:#AC8D6C00;background-color:#AC8D6C33;"> </picture> <figcaption class="hidden-xs"> <span>Growth of Calcite (CaCO3) & Gypsum (CaSO4.2H2O) on Lead/Zinc Ore Deposits</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <a href="/view/18711/" title="Growth of Calcite (CaCO3) Crystals on Lead Ore (Galena, PbS) & Zinc Ore (Zincite, ZnO)"> <figure> <picture> <source media="(max-width: 767px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18711.jpg.140x140_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18711.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 2x"> <source media="(max-width: 979px)" srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18711.jpg.230x230_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18711.jpg.460x460_q85_autocrop_crop-smart_upscale.webp 2x"> <source srcset="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18711.jpg.280x280_q85_autocrop_crop-smart_upscale.webp 1x, https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18711.jpg.560x560_q85_autocrop_crop-smart_upscale.webp 2x"> <img src="https://imaggeo.egu.eu/media/thumbs/previews/2025/03/10/18711.jpg.280x280_q85_autocrop_crop-smart_upscale.webp" alt="Growth of Calcite (CaCO3) Crystals on Lead Ore (Galena, PbS) & Zinc Ore (Zincite, ZnO)" style="color:#6C5F5700;background-color:#6C5F5733;"> </picture> <figcaption class="hidden-xs"> <span>Growth of Calcite (CaCO3) Crystals on Lead Ore (Galena, PbS) & Zinc Ore (Zincite, ZnO)</span> <small>by Metwally Hamza</small> </figcaption> </figure> </a> <div id="spinner" class="spinner-2" data-hx-indicator=".spinner-2" data-hx-get="?page=2" data-hx-trigger="intersect once" data-hx-sync=".spinner-2:drop" data-hx-target=".spinner-2" data-hx-swap="outerHTML"> <a data-script="init hide" href="?page=2">more</a> <img class="htmx-indicator" 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