Formula: Ba10Ca2MnTiSi10O30(OH,Cl,F)10
Origin of name: For John Muir, American explorer
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell:
Colour: Orange
Diaphaneity:
Luster: Subvitreous
Habit: Crystals tetragonal, subhedral to euhedral, to 3 mm
Hardness: ~ 2.5
Specific gravity: 3.86
Cleavage: 2; {001} and {100} indistinct
Tenacity:
Streak: Pale orange
Synonyms/varieties:
Comments:
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