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Xanthiosite and aerugite

Published online by Cambridge University Press:  14 March 2018

R. J. Davis ,
M. H. Hey  and
A. W. G. Kingsbury
R. J. Davis
Affiliation:
Department of Mineralogy, British Museum (Natural History)
M. H. Hey
Affiliation:
Department of Mineralogy, British Museum (Natural History)
A. W. G. Kingsbury
Affiliation:
Department of Mineralogy, University Museum, Oxford
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Summary

Two nickel arsenates from South Terras mine, St. Stephen-in-Brannell, Cornwall, have been shown to be identical with the minerals xanthiosite and aerugite, described by C. Bergemann in 1858, and with two synthetic products described by J. B. Taylor and R. D. Heyding (1958). Xanthiosite is pure golden-yellow, monoclinic, with a 10·174, b 9·548, c 5·766 Å, β 92° 58½′, space group P21/a; with D154=5·42±0·10, the unit cell contains 4[Ni3(AsO4)2] (Dcalc 5·388±0·003). Aerugite is deep blue-green, monoclinic, with a 10·29, b 5·95, c 9·79 Å, β 110° 19′, space-group C2, Cm, or C2/m; the ideal unit cell formula is 2[Ni9As3O16], with one-sixth of the arsenic trivalent; the natural mineral has a lower Ni:As ratio, around 2·6. Both xanthiosite and aerugite are minerals new to Britain.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 269 , March 1965 , pp. 72 - 83
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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References

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