Brief Description: One of its names (Stibnite) comes from the ancient times, when the mineral was known as stivi or stimi and was used as mascara. Its current name Antimonite derives from Latin antimonium, which was given by the Dark Ages alchemists who used it in gold processing and in the manufacture of antimonous glass (vitrium antimonii) that served as medicine. Its chemical formula is Sb2S3 and it belongs to sulphide minerals. Its lustre is metallic, splendent on schistose levels and fresh surfaces, while its colour varies from lead grey to steel grey, which often turns black or iridescent. It is opaque, with hardness 2 and specific gravity 4.5 - 4.6. Its crystals are often prismatic or columnar. It is also found in radiate and blade-like aggregates, as well as solid, fine-grained to rough-grained masses. On ground surface, antimonite can be oxidized and transformed into a white or yellowish mineral, Stibiconite [Sb3O6(OH)]. This oxidization sometimes leads to the forming of pseudomorphic crystals by antimonite. It is found in hydrothermal deposits of low temperature, in replacement deposits and in thermal springs. It occurs with other minerals of Sb that were formed by its decomposition, as well as with galenite, cinnabarite, sphalerite, red and yellow sandarac, sulphate salts Sb-Pb, iron pyrite, marcasite, arsenopyrite, gold, barite, calcite, ankerite and chalcedone or quartz. It constitutes the most important stibium mineral. 
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