Formula: K(V,Al,Mg)2(AlSi3)O10(OH)2
Origin of name: for H. Roscoe, English chemist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: clove-brown to greenish brown, dark green
Diaphaneity: translucent
Luster: pearly
Habit: minute scales, in stellate groups
Hardness: 2.5
Specific gravity: 2.97
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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