Formula: (Mn,Mg,Zn)22(AsO3)(AsO4)3(SiO4)3(OH)20
Origin of name: For J. McGovern, American collector
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: Light brown to deep reddish brown
Diaphaneity: Translucent
Luster: Pearly
Habit: Massive, granular, mica-like books
Hardness: 3
Specific gravity: 3.719
Cleavage: 1; {0001} perfect, micaceous
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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