Formula: (Mg,Fe)2(Fe,Sn,Mg) BO5
Origin of name: From magnesium and hulsite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity:
Luster: Submetallic
Habit: Tufts of divergent needles to 0.4 x 0.8 x 0.8 mm forming aggregates
Hardness: 6
Specific gravity: 4.18
Cleavage: None
Tenacity:
Streak: Dark brown
Synonyms/varieties:
Comments: Mg analogue of hulsite
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