Formula: BiFe2(SiO4)2(OH)
Origin of name: From composition, (iron - ferrum)
Crystal system: Monoclinic
Crystal class: m
Twinning:
Unit cell: a = 5.21 Å, b = 9.02 Å, c = 7.74 Å, b = 100.9°
Colour: Bright yellow, green
Diaphaneity: Semitransparent to translucent
Luster:
Habit: Massive; powdery
Hardness: 6
Specific gravity: 4.47
Cleavage: None
Tenacity: Brittle, even to flat conchoidal fracture
Streak: Light green
Synonyms/varieties:
Comments: Probably hydrothermally formed, in veins cutting schale
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