Formula: FeFe4(PO4)3(OH)5 . 2H2O
Origin of name: For O. Dufrenoy, French mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Dark green to greenish black, oxidizes to greenish brown to reddish brown
Diaphaneity: Transparent
Luster: Silky
Habit: Crystals indistinct, rounded, in aggregates, rare; botryoidal crusts or masses with radial-fibrous structure
Hardness: 3.5 to 4.5
Specific gravity: 3.1 to 3.34
Cleavage: 1; {100} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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