Is a variety of Samarskite with Calcium content.it
belong to the rare earth family and is medium to strong radioactive.
The formula is (Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8 . Hardness is 5-6.
It comes from Platt Pegmatite,Big Creek,Carbon Co.Wyoming,USA.and is opaque with metallic look.
Size: 7.5x6.5x4.6 mm.