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An optical and X-ray examination of the basic-slag mineral silicocarnotite

Published online by Cambridge University Press:  14 March 2018

D. P. Riley  and
E. R. Segnit
D. P. Riley
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
E. R. Segnit
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
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Extract

Blue pleochroic crystals obtained from basic slag were first described by Carnot and Richard. They published a chemical analysis, some of the optical properties, and a brief description of the forms they observed. The crystals were stated to be orthorhombic, with a composition of 5CaO.P205.SiO2. Several authors later described similar crystals. None, however, gave a thorough account of the optical properties. These various papers were summarized and discussed by Kroll, who accepted Carnot's formula, but concluded, from Bücking and Linck's examination, that the material was monoclinic. Kroll applied the rather unfortunate term ‘silico-carnotite’ to these crystals.

The present work shows that silicocarnotite occurs in only one modification–orthorhombic. The crystals drawn by Bricking and Linck and described as monoclinic are, in fact, identical with our orthorhombie crystals.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 204 , March 1949 , pp. 496 - 504
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1949

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References

page 496 note 1 Carnot, A. and Richard, A., Bull. Soc. Min. France, 1883, vol. 6, p. 237.Google Scholar

page 496 note 1 J. E., Stead, C. H., Ridsdale, and H. A., Miers, Journ. Chem. Soc., 1887, vol. 51, p. 601. It. Bücking and G. Linck, Stahl und Eisen, 1887, vol. 4, p. 245. G. Hilgenstock, Stahl und Eisen, 1883, vol. 3, p. 498.Google Scholar

page 496 note 1 Kroll, V. A., Jonrn. Iron and Steel Inst., 1911, vol. 84, p. 126. [Min. Mag. 19–349.]Google Scholar

page 498 note 1 Barrett, R. L. and McCaughey, W. J., Amer. Min., 1942, vol. 27, p. 680. [M.A. 8–312.]Google Scholar Trömel, G., Stahl und Eisen, 1943, vol. 63, p. 21 Google Scholar. Bredig, M. A., Amer. Min., 1943, vol. 28, p. 594. [M.A. 9–92.]Google Scholar