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New data on the slag-minerals nagelschmidtite and steadite

Published online by Cambridge University Press:  14 March 2018

E. R. Segnit
E. R. Segnit*
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
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Extract

In 1937 G. Nagelschmidt described a new silicophosphate mineral obtained from basic slag. It resembled the earlier described silicocarnotite (A. Carnot and A. Richard, 1883; D. P. Riley and E. R. Segnit, 1949) in its solubility in citric acid. Nagelschmidt gave optical, chemical, and X-ray data which indicated that the material had a composition of approximately 7CaO.P2O5.2SiO2, and agreed closely with a phase reported by G. Trömel (1943) in his investigation of the system CaO-P2O5-SiO2. The material was further considered by M. A. Bredig (1941), who published cell dimensions worked out from powder photographs, assuming that nagelschmidtite was a solid solution of tricalcium phosphate in a predicted high-temperature hexagonal form of dicalcium silicate. R. L. Barrett and W. J. McCaughey (1942) gave further data, chiefly connected with phase relationships in the binary system Ca2SiO4-Ca3P2O8. Finally, S. O. Agrell (1946) published further data on the slag mineral, giving the chemical analyses and optical properties of two samples, together with a discussion of the phase relationships of the material in slags, and hence in the binary system mentioned above. The name 'nagelschmidtite' is due to Barrett and McCaughey.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 210 , September 1950 , pp. 173 - 190
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1950

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