South Urals Federal Research Center of Mineralogy and Geoecology UB RAS
Abstract
Large pyrochlore crystals (up to 6 cm) from ores of the Tatarka deposit are studied, as well as their compositional zoning and relations with associated minerals. Pyrochlore was crystallized along with calcite, magnetite, fluoromagnesioarfvedsonite, zircon and some other minerals. The central part of the pyrochlore crystals corresponds to fluorcalciopyrochlore, which alternates with Sr-bearing hydroxycalciopyrochlore zones in the periphery. Pyrochlore crystals from the periphery and along the cracks were altered with noticeable deficit in position A. In addition to the minerals known at the deposit, monazite-(Ce), aeschynite-(Y), nosean, natrolite, gold, siderite, ankerite, Febearing aluminosilicate – chamosite, kaolinite, illite are found
