Formula: Ba4(Ti,Nb)8Si4O28Cl
Origin of name: After locality; Pao-t'ou (Russian Baotou), Inner Mongolia, China
Crystal system: Tetrahedral
Crystal class: 4/m
Twinning:
Unit cell: a = 19.99 Å, c = 5.908 Å
Colour: Light brown to black
Diaphaneity: Translucent to transparent
Luster: Vitreous
Habit: Small grains and subhedral crystals; masses
Hardness: 6
Specific gravity: 4.71
Cleavage: 2; {110}, second direction at 90 degrees
Tenacity: Brittle, fracture hackly
Streak:
Synonyms/varieties:
Comments: Found in quartz veins cutting quartzite near alkalic granite and syenite, in carbonate veins cutting "hornblende" gneiss intruded by diabase sills and small pegmatites
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