Kobeite ore exhibited at Mining Museum of Akita University — Photo: 掬茶 · CC BY-SA 4.0
Kobeite-(Y)
Kobeite-(Y) is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula (Y,U)(Ti,Nb)₂(O,OH)₆.
Key properties: Mohs hardness 5.5; specific gravity 4.6; Reddish brown streak; Vitreous to resinous luster.
IMA symbol Kob-Y, IMA status: approved, named in 1950.
Found in granite pegmatites (Japan); in a stream cobble of graphic granite (Paringa River, New Zealand).
It is found associated with Anatase, parisite, zircon, monazite, chevkinite, xenotime, allanite, biotite, albite, quartz, muscovite (Shiraishi pegmatite, Japan); plagioclase, allanite.
The name refers to Kobe-Mura [presently Oyama-cho], Japan, from where it was first noted.