Formula: Mn9(SiO4)4(OH)2
Origin of name: For Gerald Gibbs, American mineralogist
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: Violet pink
Diaphaneity:
Luster: Vitreous
Habit: Crystals anhedral, interlocking
Hardness: 5.5
Specific gravity: 4.00
Cleavage: None
Tenacity:
Streak: Light pink
Synonyms/varieties:
Comments: Dimorphous with sonolite
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