Formula: Ba(Mn,Fe)2TiOSi2O7(OH,F)2
Origin of name: For Bohuslav Hejman, Czech petrologist
Crystal system: Monoclinic
Crystal class: m
Twinning:
Unit cell:
Colour: Brownish to yellow
Diaphaneity: Translucent
Luster: Vitreous
Habit: Lath-shaped crystals to 1 mm
Hardness:
Specific gravity: 4.02
Cleavage: 1; {100} perfect
Tenacity:
Streak: Brownish yellow
Synonyms/varieties:
Comments:
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