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Mineralogical Magazine; June 2006; v. 70; no. 3; p. 329-340; DOI: 10.1180/0026461067030336
© 2006 Mineralogical Society of Great Britain and Ireland
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Kapellasite, Cu3Zn(OH)6Cl2, a new mineral from Lavrion, Greece, and its crystal structure

W. Krause1,*, H.-J. Bernhardt2, R. S. W. Braithwaite3, U. Kolitsch4 and R. Pritchard3

1 Henriette-Lott-Weg 8, D-50354 Hürth, Germany
2 Institut für Mineralogie, Ruhr-Universität Bochum, Universitätsstraße 150, D-44780 Bochum, Germany
3 School of Chemistry, Faraday Building, University of Manchester, Manchester M60 1QD, UK
4 Institut für Mineralogie und Kristallographie, Universität Wien, Geozentrum, Althanstraße 14, A-1090 Wien, Austria

* E-mail: We.Krause{at}t-online.de

Kapellasite, Cu3Zn(OH)6Cl2, is a new secondary mineral from the Sounion No. 19 mine, Kamariza, Lavrion, Greece. It is a polymorph of herbertsmithite. Kapellasite forms crusts and small aggregates up to 0.5 mm, composed of bladed or needle-like indistinct crystals up to 0.2 mm long. The colour is green-blue, the streak is light green-blue. There is a good cleavage parallel to {0001}. Kapellasite is uniaxial negative, {omega} = 1.80(1), {varepsilon} = 1.76(1); pleochroism is distinct, with E = pale green, O = green-blue. Dmeas = 3.55(10) g/cm3; Dcalc. = 3.62 g/cm3. Electron microprobe analyses of the type material gave CuO 58.86, ZnO 13.92, NiO 0.03, CoO 0.03, Fe2O3 0.04, Cl 16.70, H2O (calc.) 12.22, total 101.80, less O = Cl 3.77, total 98.03 wt.%. The empirical formula is (Cu3.24Zn0.75){sum}3.99(OH)5.94Cl2.06, based on 8 anions. The five strongest XRD lines are [d in Å (I/I0, hkl)] 5.730 (100, 001), 2.865 (11, 002), 2.730 (4, 200), 2.464 (9, 021/201), 1.976 (5, 022/202). Kapellasite is trigonal, space group PFormulam1, unit-cell parameters (from single-crystal data) a = 6.300(1), c = 5.733(1) Å, V = 197.06(6) Å3, Z = 1. The crystal structure of kapellasite is based on brucite-like sheets parallel to (0001), built from edge-sharing distorted M(OH,Cl)6 (M = Cu, Zn) octahedra. The sheets stack directly on each other (...AAA... stacking). Bonding between adjacent sheets is only due to weak hydrogen and O···Cl bonds. The name is in honour of Christo Kapellas (1938–2004), collector and mineral dealer from Kamariza, Lavrion, Greece.

KEYWORDS: kapellasite, new mineral, copper zinc hydroxide chloride, electron microprobe data, crystal structure, Lavrion, Greece






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