ISSN
print 2570-7337
online 2570-7345
Clinochalcomenite from the mine dump of shaft No. 11A, Příbram - Bytíz (Czech Republic)
Keywords
Abstract
Very rare hydrated copper selenite, mineral clinochalcomenite, was found in samples from the mine dump material of the shaft No. 11A Příbram-Bytíz, the Příbram uranium and base metal ore district, central Bohemia, Czech Republic. Clinochalcomenite occurs as green to bluish green spherical crystalline aggregates up to 1 mm in size. Associated minerals are brochantite, aurichalcite, devilline, schoepite, piretite and probably new copper uranyl selenite. Clinochalcomenite is monoclinic, space group P21/n, the unit-cell parameters refined from X-ray powder diffraction data are: a 8.155(3), b 8.595(2), c 6.272(2) Å, β 97.27(3)o and V 436.1(2) Å3. Its chemical analyses correspond to the empirical formula Cu0.96(SeO3)1.00·2H2O on the basis of Se+S = 1 apfu. Raman spectroscopy documents the presence of molecular water and selenite groups in the crystal structure of clinochalcomenite. The origin of clinochalcomenite is interpreted as product of (sub)recent supergene alteration of primary Cu selenides in calcite gangue in environment of mine dump material.
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References
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