Formula: Mn2SiO3(OH)2.H2O
Origin of name: after locality N'Chwaning mine, Cape Province, South Africa
Crystal system: orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: light brown
Diaphaneity: transparent
Luster: vitreous
Habit: needles, average 0.5 by 0.1 by 1 mm, in aggregates shape like pin cushions
Hardness:
Specific gravity:
Cleavage: 2; parallel to {010} and {100} perfect
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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