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...