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
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