Formula: Fe2(SO4)3 . 7H2O
Origin of name: For Kornel Hlavacsek, Hungarian geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Pink to violet
Diaphaneity:
Luster: Silky in fibrous masses
Habit: Crystals lath-like or acicular; massive, globular with radial-fibrous structure; crusts; tufted aggregates
Hardness:
Specific gravity: 2.30
Cleavage: 1; {010}
Tenacity:
Streak:
Synonyms/varieties:
Comments: Soluble in water
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