General Information:
Chemical Formula:
(Ta,Nb)BO4
Empirical Formula:
Ta0.75Nb0.25(BO4)
IMA Status:
Approved IMA 1960
Physical Properties:
Color:
pink gray.
Density:
7.81 - 7.91, Average = 7.86
Hardness:
7-7.5
Luster:
Adamantine
Streak:
white
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