Uranopolycrase
The uranium-bearing member of the euxenite group, from Elba's San Piero in Campo pegmatite.
Intro adapted from Wikipedia (CC BY-SA).
Uranopolycrase is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula (U,Y)(Ti,Nb,Ta)₂(O,OH)₆.
It crystallizes in the orthorhombic crystal system (space group Pbcn). It is a member of the Columbite structural group.
Key properties: specific gravity 6.6; Brown streak; Adamantine luster.
IMA symbol Uplc, IMA status: approved, named in 1990.
Found in a zoned pegmatite vein near the contact with granodiorite.
It is found associated with Uranoan polycrase-(Y), euxenite-(Y), manganocolumbite, titanowodginite, uranmicrolite, beryl, stilbite, quartz, orthoclase, albite, lepidolite, elbaite.
The name refers to its content of URANium and relation to polycrase-(Y).