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The crystal structure of kilchoanite, Ca6(SiO4)(Si3O10), with some comments on related phases

Published online by Cambridge University Press:  05 July 2018

H. F. W. Taylor
H. F. W. Taylor*
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
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Summary

The crystal structure of kilchoanite, Ca6(SiO4)(Si3O10), has been determined from three- dimensional X-ray methods (r = 0·089 on 348 independent reflections). It is closely related to that of γ-Ca2SiO4, which is olivine-like. In kilchoanite, slabs of γ-Ca2SiO4 structure alternate with ones composed of Ca ions and finite chains of three tetrahedra; these have the composition Si3O108− and have rarely been observed previously. A related, synthetic phase, 8CaO. 5SIO2, probably has a similar structure but with a higher proportion of γ-Ca2SiO4 regions, and should thus be formulated as Ca8(SiO4)2(Si3O10). Disordered synthetic phases also occur that appear to have similar structures with still higher proportions of γ-Ca2SiO4 regions. These phases collectively form an interesting contrast to the chondrodite minerals.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 293 , March 1971 , pp. 26 - 31
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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References

Agrell, (S.O.), 1965. Min. May. 34, 1.Google Scholar
Agrell, (S.O.), and Gay, (P.), 1961. Nature. 189, 743.10.1038/189743a0CrossRefGoogle Scholar
Black, (P.M.), 1969. Min. May. 37, 517.CrossRefGoogle Scholar
Bockle, (E.R.) and Taylor, (H.F.W.), 1958. Amer. Min. 43, 818. International Tables for X-Ray Crystallography, 1962. vol. iii. Birmingham (Kynoch Press).Google Scholar
North, (A.C.T.), 1964. Journ. Sci. Instr. 41, 42.CrossRefGoogle Scholar
O'DANIEL, (H.) and Tscheischwlli, (L.), 1942. Zeits. Krist. 104, 124.Google Scholar
[Ovramenko, (N. A.) and Govorov, (A. A.), and Lantukh, (G. V.) 1969. (Compt. Rend. Acad. Sci. URSS), 186(2), 389. (Chem. Abs. 71, 65043).Google Scholar
Roy, (D.M.), 1958. Journ. Amer. Ceram. Soc. 41, 293.CrossRefGoogle Scholar
Roy, (D.M.), 1958. Amer. Min. 43, 1009.Google Scholar
Roy, (D.M.), Garo, (J.A.), Nicol, (A.W.), and Taylor, (H.F.W.), 1960. Nature, 188, 1187.CrossRefGoogle Scholar
Smith, (D.K.), Majumdar, (A.), and Ordway, (F.), 1965. Acta Cryst. 18, 787.CrossRefGoogle Scholar
Speakman, (K.), Taylor, (H.F.W.), Bennett, (J.M.), and Gard, (J.A.), 1967. Journ. Chem. Soc. A, 1052.CrossRefGoogle Scholar
Taylor, (H.F.W.), 1969. Proc. 5th. Int. Symp. Chem. of Cements, Tokyo, 1968. 2, 1.Google Scholar