Scorodite

Scorodite

Scorodite, Gold Hill, Utah
General
Category Arsenate minerals
Formula
(repeating unit)		 FeAsO4·2H2O
Strunz classification 8.CD.10
Crystal system Orthorhombic
Unit cell a = 8.937 Å, b = 10.278 Å
c = 9.996 Å; Z = 8
Identification
Color Green, blue-green, grey, grayish-green, blue, yellow-brown, nearly colorless, violet
Crystal symmetry Orthorhombic - dipyramidal
H-M symbol (2/m 2/m 2/m)
Space group: Pcab
Fracture Sub-Conchoidal
Mohs scale hardness 3.5-4
Luster Sub-Adamantine, Vitreous, Resinous
Streak Greenish-White
Diaphaneity Translucent
Density measured: 3.27 g/cm3 calculated: 3.276 g/cm3
Optical properties Biaxial (+)
Pleochroism Weak
2V angle Measured: 40° to 75° Calculated: 46° to 80°
Dispersion relatively strong r > v
References [1]

Scorodite is a common hydrated iron arsenate mineral, with the chemical formula FeAsO4·2H2O. It is found in hydrothermal deposits and as a secondary mineral in gossans worldwide. Scorodite weathers to limonite.

Scorodite was discovered in the Schwarzenberg, Saxony district, Erzgebirge, Saxony, Germany. Named from the Greek Scorodion, "garlicky". When heated it smells of garlic, which gives it the name.

References

  1. ↑ http://www.mindat.org/min-3595.html Mindat data


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