Formula: Fe(SO4)(OH).2H2O
Origin of name: from Greek para = similar and butlerite
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: rare on {142}
Unit cell: a = 7.38 Å, b = 21.13 Å, c = 7.22 Å
Colour: orange
Diaphaneity:
Luster:
Habit:
Hardness: 2.5
Specific gravity: 2.55
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with butlerite
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