Formula: MgSO4 . 7H2O
Origin of name: Locality; Epsom, England
Crystal system: Orthorhombic
Crystal class: 222
Twinning: Rare on {110}
Unit cell: a = 11.86 Ǻ, b = 11.99 Ǻ, c = 6.858 Ǻ
Colour: Colourless, white, pinkish, greenish
Diaphaneity:
Luster: Silky to earthy
Habit: Crystals rare; fibrous to acicular crusts; stalactitic, rounded masses; efflorescence
Hardness: 2 to 2.5
Specific gravity: 1.68
Cleavage: 1; {010} perfect
Tenacity: Conchoidal
Streak:
Synonyms/varieties:
Comments: Aggregates translucent
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