Arsenolite

====This is a naturally occurring mineral, whose correct name is cubic arsenic trioxide (As2O3). It is also the primary product whenever arsenic ores are smelted, and is used in industry as a glass decolourising agent. Another related mineral with a similar silly name is arsenolamprite, which is a native form of arsenic. It can be very dangerous so be careful.====

It was first described in 1854 for an occurrence in the St Andreasberg District, Harz Mountains, Lower Saxony, Germany. It occurs by the oxidation of arsenic-bearing sulfides in hydrothermal veins. It also occurs as a result of mine or coal seam fires.

System: IsometricFormula: As2O3 Color: White, Bluish; reddish Name Arsenic in the composition Lustre: Vitreous, Silk Hardness: 1 1/2