Formula: (K,Na)2(Fe,Mn,Mg)5Si8O20(F,OH)4
Origin of name: Form locality; Mont Dore, France
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Green to brownish green
Diaphaneity:
Luster:
Habit: Grains to 25µm
Hardness:
Specific gravity: 3.15
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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