Supergene uranium mineralization from Horní Halže near Měděnec (Krušné hory Mountains), Czech Republic

Abstract

Supergene uranium mineralization was studied at Horni Halže near Měděnec, Krušné hory Mountains, Czech Republic with the help of optical and electron scanning microscopy, X-ray powder diffraction and chemical analyses. The uranyl minerals kasolite, metatorbernite, phosphuranylite, šreinite, uranophane and uranosphaerite, together with goethite and bismutoterrite, were observed and described in detail. Chemical composition and unit-cell parameters of the minerals studied are given and compared with published data. Possible paragenetic sequences and conditions of origin are discussed.