Formula: FeSO4 . 7H2O
Origin of name: From Greek melanteria, a process used to retrieve copper
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 14.08 Å, b = 6.51 Å, c = 11.05 Å, β = 105.6°
Colour: Green, greenish blue, blue, white
Diaphaneity:
Luster: Vitreous, silky
Habit: Crystals equant to short prismatic, also thick tabular or octahedral; stalactitic; fibrous; or pulverulent aggregates
Hardness: 2
Specific gravity: 1.90
Cleavage: 2; {001} perfect, {110} distinct
Tenacity: Conchoidal; brittle
Streak: Colourless
Synonyms/varieties: Calingastite (Zn-rich var.), Copperas, Pisanite (Cn-rich var.)
Comments: Soluble in water
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