Sulphides: Auripigment
Diagnostic card.
As 2 S 3
Singonia monoclinic
Hardness 1.5-2
Specific weight 6,8-6,9
Cleavage is perfect
Cracked shell
Yellow color
Color in powder yellow
Shine greasy to half-diamond
Auripigment, arsenic sulphide. The gloss is pearly, fat, thin in laminae. Colors: golden yellow, orange. The dash is yellow. Fracture shell. Cleavage is very perfect. It occurs in volcanogenic-hydrothermal deposits with realgar, cinnabar and antimonite. Crystals (monoclinic syngony) are rare. Usually leafy, scaly or earthy aggregates. An important ore of arsenic. Deposits: in Switzerland, Greece, Turkey, Iran, the USA, the CIS (Caucasus, Central Asia).
From lat aurum - gold and pigmentum - paint. Chemical composition. Arsenic (As) 61%, sulfur (S) 39%. Aggregates. Granular, platy, lenticular, broadly rooted, radial-radiant. Crystal structure. A layered molecular lattice whose layers are parallel to the c axis. The shape of the crystals. Tablit, short-prismatic, very well-educated. Cleavage. Perfect along the sides of the prism (010).
It forms short prismatic crystals of considerable size (5 cm or more in length). But usually occurs in the form of aggregates of leafy, columnar, branched structure, as well as granular masses. Auripigment has a golden yellow color, in crystals it is rather orange-yellow. On the surfaces of cleavage glitter is resin and pearlescent. The mineral is quite heavy, but soft.
Diagnostic signs.
Characteristic excellent cleavage, with the division into the thinnest transparent flexible plates. Easily melts on coal, giving a white coating; In a glass tube forms an arsenic mirror. Behavior in acids It is soluble in nitric acid and royal vodka; The sulfur that emerges emerges; In caustic potassium is soluble without residue.
Origin.
It is formed in hydrothermal veins at low temperatures, in volcanic fumaroles and as a product of weathering of other arsenic minerals, especially realgar.
Deposits and applications.
In Italy, the auripigment occurs in many places, in small numbers and always in association with the realgar. Used to obtain arsenic.
Auripigment. Arsenic (black). Kysh-Tau, Kyrgyzstan. Central Asia, the CIS. Photo: © А.А. Evseev.
Auripigment. Men-Kule River, Yakutia, Russia. The fragment of the crystal is ~ 30 cm. Photo: © А.А. Evseev.
Auripigment. Gold Bar Mine (Mine), County Eureka, pcs. Nevada, the USA. Photo: © А.А. Evseev.
Auripigment. Druzovaya crust of rosettes of table-lenticular crystals, with prisms
Red realgar, crust on a massive yellow realgar in slate. 10x6.5 cm. The Luhumi deposit,
top. R. Luhunis-Tskhali, rn Mr. They, Horn. Racha, Georgia, the CIS. Photo: © А.А. Evseev.
Auripigment. Elbrus district, North. Caucasus, Russia, the CIS. Photo: © А.А. Evseev.
Auripigment. Elbrus district, North. Caucasus, Russia, the CIS. Druzovaya crust of spherulitic beams
Crystals of auripigment on the crack wall in the vein dolomite. Photo: © А.А. Evseev.
Red coating - realgar, also arsenic sulphide with another formula - As S
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Poisonous and radioactive dangerous stones and minerals
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Catalog of minerals and semi-precious stones of the world by groups
** - poisonous stones and minerals
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