Bariomicrolite

General Information:
 Chemical Formula:
Ba2(Ta,Nb)2(O,OH)7
 IMA Status:
Approved IMA 1977
Physical Properties:
 Color:
brown, colorless, yellow, white, or pink brown.
 Density:
5.68
 Diaphaniety:
Translucent to Opaque
 Hardness:
4.5-5
 Luster:
Adamantine - Resinous
 Streak:
white
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