Synonym:
Polycrase-(Y).
Chemical: (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6;
Uranium Yttrium oxide.
Color: black or brown metallic.
Chemical: (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6.
Crystal structure: amorphous.
Hardness: 5 to 6
Specific gravity: 5.
MineralogyPolycrase is radioactive due to its uranium content of about 6%).
It occurs in granitic pegmatites.