getchellite

{{Infobox mineral | name = Getchellite | category = Sulfide mineral | boxwidth = 24 | boxbgcolor = | image = Getchellite.jpg | imagesize = 260px | caption = Getchellite from Khaidarkan, Fergana Valley, Osh Oblast, Kyrgyzstan. Specimen size 3.6 cm. | molweight = 293.81 g/mol | formula = AsSbS3 | IMAsymbol = Get | strunz = 2.FA.35 | dana = 2.11.1.2 | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/a | color = Dark red, sometimes with a purple to green iridescent tarnish | habit = Subhedral crystals and massive with a platy texture | lattice = | twinning = Simple and polysynthetic twins with the twin plane and composition plane parallel to {001} | cleavage = Perfect on {001} | fracture = Splintery | tenacity = Sectile; cleavage flakes are flexible and inelastic | mohs = 1.5 to 2 | luster = Vitreous to pearly on cleavage surfaces, otherwise resinous | refractive = n = 2.720. Dispersion r > v strong | opticalprop = Biaxial (+), 2V=46° | birefringence = | pleochroism= | streak = Orange red | gravity = 3.92 (observed) 4.0 (calculated) | density = | melt = 340 °C to 355 °C | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent | other = Not radioactive | references = }}

thumb|Red Getchellite and yellow Orpiment from the [[Getchell Mine, the type locality.]]