Formula: Fe2Si2O5(OH)4 . 2H2O
Origin of name: For W. Hisinger, Swedish chemist
Crystal system: Monocinic
Crystal class: unknown
Twinning:
Unit cell:
Colour: Black to brownish black
Diaphaneity:
Luster: Resinous
Habit: Massive, compact
Hardness: 2.5 to 3
Specific gravity: 2.67
Cleavage: None
Tenacity:
Streak: Yellowish brown
Synonyms/varieties:
Comments:
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