Epsomite

Epsomite

Sulfate mineral
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Epsomite is a hydrous magnesium sulfate mineral with formula MgSO4·7H2O.

GENERAL

Category
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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
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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
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IDENTIFICATION

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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MAJOR VARIETIES

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