Scorodite

Scorodite
General
Category	Arsenate minerals
Formula (repeating unit)	FeAsO4·2H2O
IMA symbol	Scd[1]
Strunz classification	8.CD.10
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Space group	Pcab
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
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	[2]

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[]

Further reading[]

• Palache, C., H. Berman, and C. Frondel (1951) Dana's system of mineralogy, (7th edition), v. II, pp. 763–767

External links[]

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