Kobeite-(Y)

kobeite-(Y)

parisite

monazite-(Ce)

xenotime

Formula: (Y,U)(Ti,Nb)2(O,OH)6 (?)
Multiple oxide, a metamict member of the euxenite group, yttrium-bearing mineral
Specific gravity: 4.60
Hardness: 5½
Streak: Reddish brown
Colour: Black to dark brown
RADIOACTIVE
Environments

Plutonic igneous environments
Pegmatites

Localities

At the Ushio deposit, Okuchi mine, Okuchi City, Kagoshima Prefecture, Japan, kobeite is associated with plagioclase, allanite, zircon, fergusonite, magnetite, ilmenite and pyrite (HOM).

At the type locality, Shiraishi-yama, Kobe, Kyōtango City, Kyoto Prefecture, Japan, kobeite occurs in a granite pegmatite associated with parisite, zircon, monazite, chevkinite, xenotime, biotite, albite, smoky and white quartz, anatase, allanite and muscovite (AM36.925, HOM).

At Weheka-Paringa Road bridge area, Paringa River, Westland District, West Coast Region, South Island, New Zealand, a kobeite-bearing cobble, 75 millimetres in diameter, was collected while panning sands and gravels in the river. The kobeite occurs as very dark brown prismatic crystals with a sheaf-like or radiating arrangement. The matrix consists of a coarse aggregate of oligoclase and microcline; very rare quartz, epidote, muscovite and chlorite complete the mineral assemblage (AM 42.342-353).

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