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The occurrence of an orthorhombic high-temperature form of Ca2SiO4 (bredigite) in the Scawt Hill contact-zone and as a constituent of slags (With Plates XV and XVI.)

Published online by Cambridge University Press:  14 March 2018

C. E. Tilley  and
H. C. G. Vincent
C. E. Tilley
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
H. C. G. Vincent
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
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Extract

Recent research on the polymorphism of calcium orthosilicate has broadened and to some extent modified the picture of the phase relations of this substance as presented in the pioneer studies of Day and Shepherd (1906) and Rankin and Wright (1915). These investigators recognized three distinct forms, α, β, and γ, related by transformation as follows: α⇄β at 1420° C. and β⇄γ, at 675° C. The high-temperature α form was described as monoclinic or triclinic and intimately twinned, the β form orthorhombic, and the low-temperature γ form as probably monoclinic. The optical properties of these α and β forms as reported are so closely similar that were it not for the twinning, regarded as diagnostic, the two forms would be distinguishable only with difficulty. This optical similarity was later found to be paralleled by a close agreement of the X-ray powder diffraction patterns of the two phases early noted by Hansen (1928) and confirmed among others by Insley (1936).

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 200 , March 1948 , pp. 255 - 271
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1948

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References

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