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Calaverite, or gold telluride, is an uncommon telluride of gold, a metallic mineral with the chemical formula AuTe 2, with approximately 3% of the gold replaced by silver. It was first discovered in Calaveras County, California in 1861, and was named for the county in 1868.
The undersea cliff is incised by more than 500 canyons, while landslide occurrence has been inferred from sediment samples collected from the base of the escarpment.The 2012 research on the escarpment closest to Sicily identified 70 submarine landslides as well as black coral reefs, while a 2014 survey focused further south but still on the northern part of the escarpment, especially on the ...
Rocks formations and the Dedo de Deus (God's Finger) peak in the background, Serra dos Órgãos National Park, Rio de Janeiro state, Brazil Raouché or Pigeons' Rock in Beirut, Lebanon Druid Arch, Canyonlands National Park, Utah, US View of Meteora, Greece Rock formations in Ongamira Valley, Sierras de Córdoba, Argentina Belogradchik Rocks, Balkan Mountains, Bulgaria "Jaws", an erosional fin ...
Outcrops do not cover the majority of the Earth's land surface because in most places the bedrock or superficial deposits are covered by soil and vegetation and cannot be seen or examined closely. However, in places where the overlying cover is removed through erosion or tectonic uplift , the rock may be exposed, or crop out .
The telluride mineral calaverite was first recognized and obtained in 1861 from the Stanislaus Mine, Carson Hill, Angels Camp, in Calaveras Co., California. [14] It was named for the County of origin by chemist and mineralogist Frederick Augustus Genth who differentiated it from the known gold telluride mineral sylvanite , and formally reported ...
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It is commonly associated with native gold, hessite, sylvanite, krennerite, calaverite, altaite, montbrayite, melonite, frohbergite, tetradymite, rickardite, vulcanite and pyrite. [3] Petzite forms together with uytenbogaardtite (Ag 3 AuS 2) and fischesserite (Ag 3 AuSe 2) the uytenbogaardtite group.
Dominant rock types are serpentinized dunite and olivine, with variable soil depths ranging from 0 to 60 centimetres (0 to 24 inches) and rock outcrops representing 5–10% of the local landscape. The U.S. National Vegetation Classification for this community is "Southern Blue Ridge Ultramafic Outcrop Barren" and believed to be unique to the ...