Formula: (Mn,Mg)5Fe(Si3Fe)O10(OH)8
Origin of name: For F. Gonyer, American chemist
Crystal system: Orthorhombic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Deep brown
Diaphaneity:
Luster:
Habit: Lath-like or platelets forming rounded radial aggregates
Hardness: 2.5
Specific gravity: 3.01
Cleavage: 1; {001} perfect
Tenacity:
Streak: Chocolate brown
Synonyms/varieties:
Comments:
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