General Information:
Chemical Formula:
Al4(Ta,Nb)3(O,OH,F)14
Physical Properties:
Cleavage:
None
Color:
brownish yellow, colorless, white, light brown, or light yellow.
Density:
6.7
Diaphaniety:
Transparent
Hardness:
7-7.5
Luminescence:
Fluorescent.
Luster:
Vitreous - Adamantine
Streak:
white
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