Epsomite is a hydrous magnesium sulfate mineral with formula MgSO4·7H2O.
Category | |||
Formula | MgSO4·7H2O
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Strunz classification | 7.CB.40
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Dana classification | 29.6.11.1
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Crystal system | |||
Crystal class | Disphenoidal (222)
H-M symbol: (2 2 2) |
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Space group | P212121
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Unit cell | a = 11.86, b = 11.99
c = 6.858 [Å]; Z = 4 |
Crystal habit | Acicular to fibrous encrustations
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Twinning | Rarely observed on {110}
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Cleavage | {010} perfect {101} distinct
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Fracture | Conchoidal
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Mohs scale hardness | 2
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Diaphaneity | Transparent to translucent
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Specific gravity | 1.67 - 1.68
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Optical properties | Biaxial (-)
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Refractive index | nα = 1.433 nβ = 1.455 nγ = 1.461
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Birefringence | δ = 0.028
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2V angle | Measured: 52°
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Solubility | In water
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Alters to | Dehydrates in dry air
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