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About
Group Parent: 
Mineral Data
Ca(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Physical Properties
Colour: 
Black, greenish-black
Crystal System: 
Trigonal
Streak: 
Light-brown, light-green, or white
Hardness: 
7.5
Tenacity: 
Brittle