arsenolite

{{Infobox mineral | name = Arsenolite | category = Oxide mineral | boxwidth = | boxbgcolor = | image = Arsenolite-333170.jpg | imagesize = 260px | alt = | caption = Arsenolite from the White Caps Mine, Manhattan District, Nye County, Nevada (size: 6.0 x 4.3 x 2.9 cm) | formula = As2O3 |IMAsymbol=Aso | molweight = 197.841 g/mol | strunz = 4.CB.50 | system = Cubic | class = Hexoctahedral (mm) H-M symbol: (4/m 2/m) | symmetry = Fdm | unit cell = a = 11.074 Å; Z = 16 | color = White, pale blue, pink to pale yellow if impure | habit = Common as tiny octahedra; aggregates or crusts; botryoidal, stalactitic | twinning = | cleavage = On {111} | fracture = Conchoidal | mohs = 1.5 | luster = Vitreous to silky; may be earthy or dull | refractive = n = 1.755 | opticalprop = Isotropic; may be anomalously anisotropic | birefringence = | pleochroism = | streak = white /pale white | gravity = 3.87 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent | other = Astringent, sweetish taste; toxic | references = }} Arsenolite is an arsenic mineral, with chemical formula As2O3. It is formed as an oxidation product of arsenic sulfides. Commonly found as small octahedra, it is white, but impurities of realgar or orpiment may give it a pink or yellow hue. It can be associated with its dimorph claudetite (a monoclinic form of As2O3) as well as realgar (As4S4), orpiment (As2S3) and erythrite, Co3(AsO4)2·8H2O.

Arsenolite belongs to the minerals which are highly toxic.