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New data on georgiadesite

Published online by Cambridge University Press:  05 July 2018

Roland C. Rouse  and
Pete J. Dunn
Roland C. Rouse
Affiliation:
Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
Pete J. Dunn
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington DC 20560, USA
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Abstract

The chemistry and crystallography of type georgiadesite from Laurion, Greece, have been reexamined using electron microprobe analysis along with powder and single-crystal X-ray diffraction. Georgiadesite is monoclinic, P21/c, with a = 13.803(10), b = 7.910(2), c = 10.812(4) Å, and β = 102.68(3)°. No twinning was observed. The probable chemical formula is either Pb16(AsO4)4Cl14O2(OH)2 or Pb16(AsO4)4Cl14(OH)6. The calculated densities for these formulae are 6.39 and 6.44 g/cm3, respectively, compared to a measured value of 6.3 + 0.3 g/cm3

Type
Research Article
Information
Mineralogical Magazine , Volume 47 , Issue 343 , June 1983 , pp. 219 - 220
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1983

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References

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