Austinite
Chemical Formula	CaZnAsO4(OH)
Species	Phosphates
Crystal System	Orthorhombic
Mohs Scale	4
Specific Gravity	4.12
Color	Colourless, white to pale yellowish-white or bright green, colourless in transmitted light[2]
Streak	White
Luster	Sub-Adamantine, Sub-Vitreous, Greasy, Silky
Refractive Index	n = 1.759(3) n = 1.763(3) n = 1.783(3)
Diaphaneity	Transparent, Translucent
Cleavage	Distinct/GoodGood on .
Crystal Habit：Well developed orthorhombic crystals of bladed or acicular habit elongated parallel to the c axis, sometimes with sceptre-like terminations, also radially fibrous crusts and nodules. Common forms are {110}, {111}, {1–11}, {010} and {011}.[3]
Geological Setting：A rare mineral in the oxidation zone of arsenic bearing base metal deposits.