Formula: (Mg,Mn)2ZnSiO4(OH)2
Origin of name: for E. Germstmann, American collector
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: White to pale pink
Diaphaneity: Transparent to opaque
Luster: Vitreous to subadamantine on cleavage
Habit: Crystals prismatic, in bunches forming mats and sprays, not terminated
Hardness: 4.5
Specific gravity: 3.68
Cleavage: 1; {010} good
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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