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The composition of francolite

Published online by Cambridge University Press:  14 March 2018

E. B. Sandell ,
M. H. Hey  and
Duncan McConnell
E. B. Sandell
Affiliation:
Department of Analytical Chemistry, University of Minnesota, Minneapolis, Minnesota
M. H. Hey
Affiliation:
Department of Mineralogy, British Museum, London
Duncan McConnell
Affiliation:
Department of Geology, University of Texas, Austin, Texas
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Extract

In 1850, T. H. Henry published an imperfect analysis of francolite, a supposed new mineral, previously named by H. J. Brooke. Henry stated that his material was similar to the material from Wheal Franco, Tavistock, Devon, but he does not show how he was in a position to know the composition of the material from this mine, because there is no record to indicate that the mineral from Wheal Franco had been analysed. Henry did not report CO2 for the material he analysed, but M. H. N. Story-Maskelyne and W. Flight analysed material, supposedly similar, and obtained a significant amount of CO2.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 25 , Issue 166 , September 1939 , pp. 395 - 401
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1939

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References

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page 398 note 4 We are indebted to Mr. Lynn Gardiner, of the University of Minnesota, for the preparation of the powder diffraction photograph.

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page 400 note 1 Calculations of atomic ratios have also been made to bases of (O+OH+F) = 26, of (Ca+Mg+P+C) = 16, and of total atoms = 42; all agree in showing approximately 0.2 atom carbon replacing calcium.

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