Churchit-(Y) z uranového ložiska Zálesí v Rychlebských horách (Česká republika)
Svatopluk Civiš, Vlastimil Toegel, Petr Pauliš
Relatively rare yttrium phosphate, churchite-(Y), was found at mine dump in the abandoned uranium deposit Zálesí in the Rychlebské hory Mountains (Czech Republic). Churchite-(Y) forms light grey and white-grey globular aggregates up to 0.5 mm in size composed by tiny tabular crystals. Churchite-(Y) was identified by PXRD and its chemical composition corresponds to the empirical formula (Y0.72Ca0.16Nd0.05 Sm0.03Gd0.03Dy0.03La0.02Er0.02)Σ1.06 [(PO4)0.97(AsO4)0.01]Σ0.98.2 H2O on the basis 2 apfu. The churchite-(Y) find at Zálesí represents sixth proved occurrence of this mineral phase in the Czech Republic.