Formula: Fe2(SO4)2(OH)2 . 7H2O
Origin of name: For T. Hohmann, Chilean mining engineer
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: Brown, orangish brown, reddish brown
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Crystals short prismatic; aggregates of subhedral crystals
Hardness: 3
Specific gravity: 2.2
Cleavage: 3; {010} perfect, {110} and {1-10} distinct
Tenacity:
Streak: Orange-yellow
Synonyms/varieties:
Comments:
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