Samarskite(Y)

minerals

columbite

monazite

zircon

Formula: YFe3+Nb2O8
Multiple oxide, samarskite group
Specific gravity: 5 to 5.69
Hardness: 5 to 6
Streak: Dark reddish brown to black
Colour: Black internally, pale to yellow-brown surface
RADIOACTIVE
Environments

Pegmatites

Samarskite-(Y) is an accessory mineral in rare earth rich granite pegmatites, common but not abundant, rarely as a detrital mineral. Associated minerals include columbite, zircon, monazite, uraninite, aeschynite, magnetite, albite, topaz, beryl, garnet, muscovite and biotite (HOM). Samarskite-(Y) occurs naturally in the metamict state due to the presence of significant amounts of radioactive elements such as uranium and thorium as impurities (AM 69.377-379).

Localities

Near Sabinópolis, Minas Gerais, Brazil, samarskite-(Y) occurs in parallel growth with columbite (Dana).

At Maisonneuve mine, Saint-Michel-des-Saints, Matawinie RCM, Lanaudière, Quebec, Canada, samarskite-(Y) occurs with beryl and fergusonite (Dana).

At Antanamalaza, district of Ambatolampy, Vakinankaratra Region, Madagascar, samarskite-(Y) occurs with almandine and magnetite (Dana).

At Ånnerud (Ånnerød), Våler, Østfold, Norway, samarskite-(Y) occurs with columbite in a pegmatite (Dana).

At Miass, Chelyabinsk Oblast, Russia, samarskite-(Y) occurs with columbite, aeschynite, monazite and garnet (Dana).

The type locality is Pit No. 50, Ilmen Mountains, Chelyabinsk Oblast, Russia.

At Topsham, Sagadahoc county, Maine, USA, samarskite-(Y) occurs with monazite (Dana).

At Spruce Pine, Mitchell county, North Carolina, USA, samarskite-(Y) occurs with columbite and a variety of microlite (Dana).

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