Formula: Ca2(Fe,Mg)B2Si2O10
Origin of name: From Greek for to occur together
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Dark brown to black
Diaphaneity:
Luster: Resinous to vitreous
Habit: Crystals tabular
Hardness: 5
Specific gravity: 3.36 to 3.38
Cleavage: None
Tenacity:
Streak: Grayish
Synonyms/varieties:
Comments:
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