Formula: BaMn2Si2O7(OH)2.H2O
Origin of name: for W. Noel Benson, New Zealand mineralogist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: dark brown
Diaphaneity:
Luster: earthy to vitreous
Habit: mosaics of anhedral to elongated blocky grains to 100 micron, as aggregates to 1 mm, veinlets to 0.25 mm across, rarely euhedral
Hardness: 4
Specific gravity: 3.87
Cleavage: none
Tenacity:
Streak: yellow brown
Synonyms/varieties:
Comments:
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