Formula: (Mn,Mg)2(Mn,Sb,Fe)BO5
Origin of name: For Fritz Blatter (1943-), German engineer and mineral collector
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Black
Luster: Metallic to submetallic
Habit: Lath-shaped crystals to 5 mm long
Hardness: 6
Specific gravity: 4.7
Cleavage: 2; {001} perfect, {100} imperfect
Tenacity:
Streak: Brown
Synonyms/varieties:
Comments:
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