Scorodite
Chemical Formula	FeAsO4·2H2O
Species	Phosphates
Crystal System	Orthorhombic
Mohs Scale	3-4
Specific Gravity	3.276
Color	Green, blue-green, grey, grayish-green, blue, yellow-brown, nearly colourless, Purple; colourless to faintly greenish or greenish brown in transmitted light.
Streak	Greenish-White
Luster	Sub-Adamantine, Vitreous, Resinous
Refractive Index	n = 1.741 - 1.784 n = 1.744 - 1.805 n = 1.768 - 1.820
Diaphaneity	Translucent
Cleavage	Imperfect/FairImperfect on , traces on
Fracture	Sub-Conchoidal
Crystal Habit：Crystals commonly pyramidal (sometimes pseudo-octahedral), tabular , or prismatic. Commonly aggregated into crusts or irregular groups. Also occurs massive, crystalline or porous and sinter-like, earthy.
Geological Setting：In the secondary oxidation zone of iron bearing arsenides, in gossans; also observed in a primary hydrothermal deposit (Saubach).