Formula: (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38
Origin of name: For M. Mathias, South African geologist
Crystal system: Hexagonal
Crystal class: -3
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Opaque
Luster: Metallic
Habit: Aggregates, polycrystalline or homogeneous, massive
Hardness: 7 to 7.5
Specific gravity: 4.60
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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