Publication at Faculty of Science |
2009
Abstract
Rare supergene minerals of the crandallite-group (florencite-(Ce), goayzite, crandallite), thometzekite and walpurgite were found at the material from abandoned Sn-W deposit Cínovec, the Krušné hory Mountains, northern Bohemia, Czech Republic. Crandallite-group minerals form strongly zoned orange to red crystals up to 0.4 mm in cavities of quartz – cassiterite – wolframite gangue.
Thometzekite forms yellow or yellow green aggregates up to 2 mm on cavities of quartz gangue in association with segnitite, fluorite, opal and mixite. Walpurgite was found as groups of well-formed lath-like light yellow crystals up to 2 mm in the length in cavity of quartz gangue.
The physical and chemical data for all described mineral phases are given.