Samarskite

Samarskite or properly samarskite-(Y) is a radioactive mineral with the empirical formula: Y_0.2REE_0.3Fe³⁺_0.3U_0.2Nb_0.8Ta_0.2O₄
Other formulas show Ce (cerium) rather than the generic REE (Rare earth element) and include essential titanium. (Y,Ce,U,Fe)₃(Nb,Ta,Ti)₅O₁₆
YFe³⁺Nb₂O₈
(Y,Fe³⁺,U)(Nb,Ta)O₄

Samarskite crystallizes in the orthorhombic - dipyramidal class as black to yellowish brown stubby prisms although it is typically found as anhedral masses. Specimens with a high uranium content are typically metamict and appear coated with a yellow brown earthy rind. Samarskite occurs in granite pegmatites with other rare minerals.

Samarskite was first described in 1847 for an occurrence in Miass, Ilmen Mountains, Southern Ural Mountains of Russia. The chemical element samarium was first isolated from a specimen of samarskite in 1879. Samarium was named after samarskite which was named for the Russian mine official, Colonel Vasili Samarsky-Bykhovets (1803-1870).

See also

List of minerals
List of minerals named after people

Translation of "Samarskite"

German: Samarskit, Italian: Samarskite-(Y), Portuguese: Samarskita.