Polycrase
(Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6IMA symbol Plc[1] Identification Mohs scale hardness 5-6 Specific gravity 5 Other characteristics 
RadioactiveOxide minerals
Silicate minerals Other 
Minerals portal
RadioactivePolycrase or polycrase-(Y) is a black or brown metallic complex uranium yttrium oxide mineral with the chemical formula (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6. It is amorphous. It has a Mohs hardness of 5 to 6 and a specific gravity of 5. It is radioactive due to its uranium content (around 6%). It occurs in granitic pegmatites.
Polycrase forms a continuous series with the niobium rich rare earth oxide euxenite.
It was first described in 1870 at Rasvag, Hidra (Hittero) Island, near Flekkefjord, Norway. It is found in Sweden, Norway, and the United States.
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- Mindat with location data
- Webmineral
- v
- t
- e
Titanium minerals
| Simple |
|
|---|---|
| Mixed |
|
Minerals portalThis article about a specific oxide mineral is a stub. You can help Wikipedia by expanding it. |
- v
- t
- e
