Yttrocolumbite-(Y)

General Information:
 Chemical Formula:
(Y,U,Fe++)(Nb,Ta)O4
 IMA Status:
Approved IMA 1987
 Locality:
Mozambique.
 Name Origin:
Named for the composition (Ytterbium, Columbium (former name for niobium)).
Physical Properties:
 Color:
black.
 Density:
5.7 - 6.15, Average = 5.92
 Diaphaniety:
Subtranslucent to Opaque
 Hardness:
5-6 - Between Apatite and Orthoclase
 Luster:
Sub Metallic
 Streak:
brown
More details...