Formula: Mn9(SiO4)4(OH,F)2
Origin of name: after locality Sono manganese mine, Japan
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: reddish orange, pinkish brown to dark reddish brown to dark brown
Diaphaneity:
Luster: dull to vitreous
Habit: crystals prismatic, massive, fine-grained
Hardness: 5.5
Specific gravity: 3.82
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with jerrygibbsite
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