Formula: FeC2O4 . 2H2O
Origin of name: For Baron von Humboldt, German naturalist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Yellow to brownish yellow
Diaphaneity: Transparent to translucent
Luster: Resinous to dull
Habit: Crystals elongated prismatic or platy; capillary; fibrous crusts; fine-granular, earthy, or compact
Hardness: 1.5 to 2
Specific gravity: 2.28
Cleavage: 3; {110} perfect, {100} and {010} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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