Gadolinite-(Y)
Frikstad 12 Feldspar Quarry, Frikstad, Iveland, Agder, Norway
Matrix specimen with single, well placed crystal in pegmatite matrix. The crystal is 2,5 cm. The crystal is somewhat altered and has a "rusty" patina. The brown patina is due to oxidation of Fe ( Fe2+O <-> Fe3+(OH)).
Associated minerals are muscovite, garnet, allanite-Ce, plagioclase, quartz, possibly REE-bearing ...
© Olav Revheim