Formula: (K,Na,Ca)(Mn,Al)7Si8O20(OH)8.2H2O
Origin of name: after locality Parsettens Alp, Grisons, Switzerland
Crystal system: orthorhombic, pseudohexagonal
Crystal class: unknown
Twinning:
Unit cell: a = 5.6 Å, b = 9.8 3, c = 12.6 Å
Colour: copper-red
Diaphaneity:
Luster: metallic (somewhat)
Habit: massive, somewhat micaceous
Hardness: about 1.5 (approximate)
Specific gravity: 2.59
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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