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Potassium sulfate mineral From Wikipedia, the free encyclopedia
Arcanite is a potassium sulfate mineral with formula K2SO4.
Arcanite | |
---|---|
General | |
Category | Sulfate mineral |
Formula (repeating unit) | K2SO4 |
IMA symbol | Acn[1] |
Strunz classification | 7.AD.05 |
Crystal system | Orthorhombic |
Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
Space group | Pmcn |
Unit cell | a = 5.77, b = 10.07 c = 7.48 [Å]; Z = 4 |
Identification | |
Color | White to colorless, yellow |
Crystal habit | Tabular crystals, typically in crusts and coatings |
Twinning | Cyclic on {110} |
Cleavage | Good on {010} and {001} |
Mohs scale hardness | 2 |
Luster | Vitreous |
Streak | White |
Diaphaneity | Transparent to translucent |
Specific gravity | 2.66 |
Optical properties | Biaxial (+) |
Refractive index | nα = 1.494 nβ = 1.495 nγ = 1.497 |
Birefringence | δ = 0.004 |
2V angle | Measured: 67° |
References | [2][3][4] |
Arcanite was first described in 1845 for an occurrence in old pine railroad ties in the Santa Ana tin mine, Trabuco Canyon, Santa Ana Mountains, Orange County, California, US.[2][4] It has also been reported from hydrothermal deposits in the Cesano geothermal field, Latium, Italy; in bat guano on the Chincha Islands of Peru; and in caves in Western Australia, South Africa and Namibia.[4]
Well-crystalline specimens sold as 'arcanite' are grown synthetically in places such as Poland for the decorative specimen market and are not natural minerals.[2]
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