Formula: HFe(SO4)2.4H2O
Origin of name: from rhombic habit and Greek for fracture
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: colourless, white, gray, yellowish, greenish, bluish
Diaphaneity: transparent
Luster: vitreous to pearly
Habit: crystals platy, thin flattened, stalactitic, bladed radiating structure
Hardness: 2
Specific gravity: 2.23
Cleavage: 2; {001} perfect, {110} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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