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X-ray powder diffraction data for botallackite

Published online by Cambridge University Press:  01 March 2012

Werner Krause
Werner Krause*
Affiliation:
Henriette-Lott-Weg 8, D-50354 Huerth, Germany
*
a)Electronic mail: we.krause@t-online.de
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Abstract

Botallackite, Cu2(OH)3Cl, from the Botallack mining area in Cornwall, United Kingdom, has been reinvestigated regarding physical, optical, chemical, and X-ray powder diffraction data. It forms emerald-green tabular crystals slightly elongated along [010] with {001} (dominant), {100}, {010}, and {011}. Botallackite is biaxial positive, 2V=70(2)°, the optical orientation is Y∧c 22(2)° (in obtuse β), Z=b. Electron-microprobe analyses gave CuO 73.26, ZnO 0.22, Cl 16.80, H2O (calc) 12.37, total 102.65, less O=Cl 3.79, total 98.86 wt %, corresponding to the empirical formula Cu1.99Zn0.01(OH)2.97Cl1.03 (based on four anions). Unit cell parameters refined from X-ray powder diffraction data are a 5.7155(5), b 6.1255(6), c 5.6336(4) Å, β 93.090(8), V 196.95(2)Å3,Z=2.

Keywords

botallackitemicroprobe analysisoptical dataX-ray powder diffraction data
Type
New Diffraction Data
Information
Powder Diffraction , Volume 21 , Issue 1 , March 2006 , pp. 59 - 62
Copyright
Copyright © Cambridge University Press 2006

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