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Cornubite, a new mineral dimorphous with cornwallite

Published online by Cambridge University Press:  14 March 2018

G. F. Claringbull ,
M. H. Hey  and
R. J. Davis
G. F. Claringbull
Affiliation:
Dept. of Mineralogy, British Museum (Natural History)
M. H. Hey
Affiliation:
Dept. of Mineralogy, British Museum (Natural History)
R. J. Davis
Affiliation:
Dept. of Mineralogy, British Museum (Natural History)
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Summary

A new copper arsenate, dimorphous with cornwallite, has been found on specimens from five localities in Cornwall, one in Devon, and one in Cumberland. The name cornubite (from Cornubia, the medieval Latin name for Cornwall) is proposed for the new mineral. Chemical analyses of cornubite and cornwallite agree well with Cu5(AsO4)2(OH)4; sp. gr. cornubite 4·64, cornwallite 4·52. X-ray study suggests that the unit-cell of cornubite has a volume of 228 Å.3 or a simple multiple thereof. New X-ray data for cornwallite (a 17·33, b 5·82, c 4·60 Å., β 92° 13′) agree well with L. G. Berry's except for a. Powder data for both are given.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 244 , March 1959 , pp. 1 - 5
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1959

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References

page 2 note on 1 Acta Cryst., 1948, vol. 1, p. 290.

page 4 note on 1 Amer. Min., 1951, vol. 36, p. 490.