Formula: Mg2(Fe,Mg,Al,Sb)(BO3)O2
Origin of name: For C. Chesterman
Crystal system: Orthorhombic
Crystal class:2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Grayish green to black
Diaphaneity:
Luster: Vitreous to silky
Habit: Fibrous to asbestiform, crystals to 2 x 0.33 x 0.06mm
Hardness: 6
Specific gravity: 3.72
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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