General Information:
Chemical Formula:(Y,Fe+++,U)(Nb,Ta)5O4
IMA Status:Approved IMA 1987
Name Origin:The element samarium (Sm) was named after this mineral.
Physical Properties: Cleavage:[???] Imperfect
Color:black, brownish, or yellowish brown.
Density:5.6 - 5.8, Average = 5.69
Diaphaniety:Opaque
Habits:Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:5-6 - Between Apatite and Orthoclase
Luminescence:Non-fluorescent.
Luster:Vitreous - Resinous
Streak:reddish brown
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