Yttrotantalite-(Y)

General Information:
 Chemical Formula:
(Y,U,Fe++)(Ta,Nb)O4
 IMA Status:
Approved IMA 1987
Physical Properties:
 Cleavage:
[???] Imperfect
 Color:
brownish black, yellowish brown, or yellow.
 Density:
5.5 - 5.9, Average = 5.7
 Diaphaniety:
Opaque to subtranslucent
 Hardness:
5-5.5 - Apatite-Knife Blade
 Luminescence:
Non-fluorescent.
 Luster:
Sub Metallic
 Streak:
colorless gray
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