Kenoplumbomicrolite
Kenoplumbomicrolite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula (Pb, )₂Ta₂O₆[ ,(OH),O].
It crystallizes in the cubic crystal system (space group Fd-3m). It is a member of the Pyrochlore-microlite structural group.
Key properties: Mohs hardness 6; specific gravity 7.31–7.83; White streak; Greasy luster.
IMA symbol Kpmic, IMA status: approved, named in 2015.
Found in an ‘amazonite’ pegmatite vein in an alkaline granite pluton.
It is found associated with Quartz, biotite, microcline, zinnwaldite, anglesite, bastnäsite-(Ce), bismite, bismuth, bismuthinite, bismuthite, cassiterite, caysichite-(Y), churchite-(Y).
The first prefix, keno, indicates dominant vacancy at the Y site, the second prefix, plumbo, indicates the dominant lead in the A site of a member of the microlite subgroup.