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Philipsburgite from Krásno near Horní Slavkov, Slavkovský les Mts. (Czech Republic)


Volume 24, issue 2 (2016), pages 243-251

Keywords

Abstract

A rare mineral philipsburgite, monoclinic (Cu,Zn)6(AsO4,PO4)2(OH)6·H2O, was found in an old abandoned Sn-W deposit Krásno near Horní Slavkov, Slavkovský les Mountains (Czech Republic). Philipsburgite occurs there as dark green radial aggregates filling quarz cavities up to 10 x 7 x 5 mm in size and as flattened crystals forming spherical aggregates up to 4 mm across in association with pseudomalachite, Zn rich libethenite and olivenite. Its origin is connected to in-situ supergene weathering of primary arsenopyrite and primary phosphates and high activity of Cu, Zn, As and P in supergene fluids. Philipsburgite is monoclinic, space group P21/c with following unit-cell parameters refined from the X-ray powder diffraction data: a 13.329(4), b 9.200(2), c 10.690(3) Å, β 96.91(5)° and V 1203.4(6) Å3. Its chemical analyses correspond to the empirical formula (Cu4.64Zn1.08Al0.01)Σ5.73[(AsO4)1.07(PO4)0.92(SiO4)0.01]Σ2.00 (OH)5.45·H2O on the basis of As+P+Si = 2 apfu.

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