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A solid solution series between xenotime (YtPO4) and chernovite (YtAsO4)

Published online by Cambridge University Press:  05 July 2018

Stefan Graeser ,
Hans Schwander  and
Hans A. Stalder
Stefan Graeser
Affiliation:
Department of Mineralogy, Natural History Museum, Basel, and Mineralogical Institute, University of Basel, Switzerland
Hans Schwander
Affiliation:
Mineralogical Institute, University of Basel
Hans A. Stalder
Affiliation:
Natural History Museum, Bern, Switzerland
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Summary

The mineral chernovite, described as a new mineral from the Urals by Russian mineralogists in 1967 (Goldin et al, 1967), has been found at three different localities in mineral fissures in the Binnatal, Switzerland, and a little to the south, in Italy. The mineral occurs in greenish-yellow bipyramidal crystals up to about I mm. A detailed single-crystal study of several specimens showed that the lattice constants vary considerably on either side of those published for the original chernovite. The refractive indices, too, display some variation. Microprobe analyses of this material, and of xenotime specimens from the same region, revealed that there exists at least partial solution between chernovite and xenotime. The three chernovite samples have molar percentages of 63·2, 73·2, and 82·0 % YtAsO4 (the Urals chernovite has about 95·2 %). These studies prove the existence of an isomorphous series between xenotime and chernovite, at least in the As-rich portion.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 302 , June 1973 , pp. 145 - 151
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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References

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