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Embreyite, a new mineral from Berezov, Siberia

Published online by Cambridge University Press:  05 July 2018

S. A. Williams
S. A. Williams*
Affiliation:
British Museum (Natural History), Cromwell Road, London S.W. 7
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Summary

Embreyite is a new mineral that has been found only in old specimens collected at Berezov, Siberia. The composition is Pb4·97(CrO4)2·00(PO4)1·91.0·75H2O, or Pb5(CrO4)2(PO4)2. H2O based on both wet and electron-probe analyses. Z = I, D meas 6·45, D eale 6·41. Crystals are monoclinic with a 9·755 Å, b 5·636, c 7·135, β 103°5′ the space group may be P21/m. No single crystals were found. α = 2·20, β = γ = 2·36. Colour in various shades of orange with a yellow streak. H = 3½; no cleavages observed. Occurs with vauquelinite, crocoite, and phoenicochroite in the oxide zone assemblage from Berezov.

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 299 , September 1972 , pp. 790 - 793
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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Footnotes

1

Permanent address: Phelps Dodge Corpn., Douglas, Arizona 85607.

References

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