Formula: FeSO4(OH).3H2O
Origin of name: From Greek, reference to red colour
Crystal system: Triclinic
Crystal class: -1
Unit cell: a = 8.9 Å, b = 11.56 Å, c = 6.64 Å, a = 95.635°, b = 90.985°, g = 97.625°
Colour: Red, orangish red to brownish red
Diaphaneity: Transparent
Habit: Crystals short to long prismatic; somewhat flattened to nearly square cross-section; usually columnar or bladed masses
Hardness: 2.5
Specific gravity: 2.23
Cleavage: 2; [010], [100] perfect
Streak: Yellow
Synonyms/varieties:
Comments:
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