Formula: MnAl6Si4O17(OH)2
Origin of name: For Charles J. Davreux, Belgian pharmacist and naturalist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: White to pale rose
Diaphaneity:
Luster: Silky to dull
Habit: Long fibers and fibrous masses
Hardness: 2 to 3
Specific gravity: 3.15
Cleavage: 1; {100} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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