Agardit-(Y) z ložiska Sn-W Cínovec v Krušných horách (Česká republika)

Pages 64-68
Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze | 2011/19/1

Rare Y-REE copper arsenate, mineral agardite-(Y), was found in the material from the abandoned Sn-W deposit, Krušné hory Mountains, northern Bohemia, Czech Republic. Agardite-(Y) forms very light green hemispherical to spherical aggregates up to 0.2 mm in association with green chrysocolla and yellow baryte in cavity of quartz gangue. Agardite-(Y) is hexagonal, space group P63/m, the unit-cell parameters refined from X-ray powder diffraction data are: a 13.5448(8), c 5.8804(6) Å and V 934.3(1) Å3. Electron microprobe analyses correspond to empirical formula (Y0.26Dy0.14Yb0.13Nd0.08Er0.08Pb0.08Gd0.07Sm0.07Ce0.01La0.01Ca0.01)Σ0.94 Cu5.96[(AsO4)2.46 (SiO4)0.53(PO4)0.01]Σ3.00 (OH)5.08 . 3H2O on the basis (As+Si+P) = 3 apfu.

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