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Quartz-feldspar porphyry
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Quartz-feldspar porphyry
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. This is a form of igneous rock � ated through the cooling of lava or magma � posed of large-grained crystals in a more finely grained material
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Antarctic Antarctica Extrusion Extrusive Extrusive Rock Feldspar Igneous Lava Magma Mineral Porphyry Quartz Scott Scott Expedition Silicate Silicate Mineral Tectosilicate Terra Nova Terra Nova Expedition Volcanic
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This photograph showcases a remarkable geological specimen of Quartz-Feldspar Porphyry, collected during Sir Robert Falcon Scott's British Antarctic Expedition (1910-1913), also known as the Terra Nova Expedition. The expedition, which had a broad scientific programme, resulted in the collection of thousands of geological and zoological specimens. Quartz-Feldspar Porphyry is a type of igneous rock, formed through the cooling and solidification of lava or magma. This particular specimen exhibits large-grained crystals of quartz and feldspar, embedded in a more finely grained matrix. The crystals' striking contrast against the darker background adds to the visual allure of the rock. The rock's formation is characterized as extrusive, as it cooled and solidified on the Earth's surface, resulting in the formation of a porphyritic texture. The crystals' size and distribution suggest that the magma cooled relatively slowly, allowing the larger crystals to form before the remaining magma solidified. Quartz and Feldspar are both silicate minerals, with quartz being a tectosilicate and feldspar a plagioclase or orthoclase. The presence of these minerals in the porphyry indicates the magma's composition and the specific conditions under which it cooled. This photograph is a testament to the rich geological discoveries made during the Terra Nova Expedition, which significantly advanced our understanding of the Antarctic continent's geology. The expedition's scientific achievements continue to inspire and inform modern geological research.
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