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Alkaline-earth-rare-earth silicate and germanate apatites

Published online by Cambridge University Press:  14 March 2018

A. G. Cockbain  and
G. V. Smith
A. G. Cockbain
Affiliation:
The Plessey Company Limited, Allen Clark Research Centre, Caswell, Toweester, Northamptonshire
G. V. Smith
Affiliation:
The Plessey Company Limited, Allen Clark Research Centre, Caswell, Toweester, Northamptonshire
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Summary

A number of new alkaline-earth-rare-earth silicate and germanate compounds with the apatite-type structure have been synthesized including a new calcium lanthanum silicate, Ca4La6(SiO4)6(OH)2, which has a 9·63 Å, c 7·12, and c/a 0·740. This has a random distribution of Ca2+ and La3+ over the (4f) and (6h) sites in the lattice. X-ray data are given for Ca4La6(SiO4)6(OH)2 together with cell dimensions for other synthetic silicate and germanate apatites. Silicate apatites with partially occupied or vacant halogen (2a) sites analogous to those of the pyro- morphites have been prepared, and a classification for silicate apatites based on synthetic end-members is proposed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 279 , September 1967 , pp. 411 - 421
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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