Cordierite-biotite-gneiss
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Cordierite-biotite-gneiss
Geological specimen collected by Scotts British Antarctic Expedition 1910-1913, also known as the Terra Nova expedition. It had a broad scientific programme and collected thousands of geological and zoological specimens. The banding of a gneiss is caused by minerals growing under huge pressures deep in the Earths crust
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Media ID 8623392
© Mary Evans Picture Library 2015 - https://copyrighthub.org/s0/hub1/creation/maryevans/MaryEvansPictureID/10717218
Cordierite Cyclosilicate Iolite Metamorphic Mica Mineral Phyllosilicate Scott Scott Expedition Silicate Silicate Mineral Sunstone Terra Nova Terra Nova Expedition Biotite Gneiss
EDITORS COMMENTS
This photograph showcases a remarkable geological specimen of Cordierite-biotite-gneiss, collected during the historic Terra Nova Expedition (1910-1913) led by Sir Robert Falcon Scott. The Terra Nova Expedition, also known as the Scott Expedition, was a British endeavor marked by an extensive scientific program that yielded thousands of valuable geological and zoological specimens. The Cordierite-biotite-gneiss displayed in this image is a metamorphic rock, formed when other rocks, such as igneous or sedimentary, undergo a transformation under immense pressures and temperatures deep within the Earth's crust. This particular gneiss exhibits striking banding, a result of the minerals growing in distinct layers. The prominent minerals in this gneiss are biotite, a phyllosilicate or sheet silicate mineral, and cordierite, a cyclosilicate or cyclic silicate mineral. Biotite is characterized by its dark, hornblende-like appearance, while cordierite is known for its distinctive pink to red color and prismatic crystals. The presence of these minerals in the gneiss is a testament to the complex geological history of the Earth. Biotite forms under high temperatures and pressures, while cordierite typically forms under conditions of moderate to high temperatures and high pressures. The coexistence of both minerals in this specimen suggests a complex metamorphic history. This photograph serves as a captivating reminder of the scientific discoveries made during the Terra Nova Expedition and the fascinating geological processes that shape our planet.
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