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The identity of jurupaite and xonotlite

Published online by Cambridge University Press:  14 March 2018

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

Jurupaite was discovered at Crestmore, California, by A. S. Eakle in 1921. The mineral was found in a quarry which was rapidly being enlarged, and Eakle stated that it was probably represented only by the one specimen which he had collected. He showed that it was a hydrated calcium silicate containing magnesia, with the composition 2(Ca,Mg)O. 2SiO2. H2O, the ratio of lime to magnesia being approximately 7 : 1.

This specimen passed into the keeping of Professor A. Pabst, who kindly made a portion available to the writer. He confirmed that it was unlikely that any other specimen existed. The jurupaite consisted of rosettes of white needles or fibres, about a centimetre in diameter. A brown discoloration was observed on the exposed outer surfaces of the specimen, but not on freshly cut surfaces. Calcite was present in contact with the jurupaite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 224 , March 1954 , pp. 338 - 341
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1954

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References

Page 338 Note 1 Eakle, A. S., Amer. Min, 1921, vol. 6, p. 107.Google Scholar [M.A. 1-253.]

Page 339 Note 1 Larsen, E. S., Amer. Min., 1923, vol. 8, p. 181.Google Scholar [M.A. 2-253.]

Page 339 Note 2 Schaller, W. T., Ibid., 1950, vol. 35, p. 911.Google Scholar [M.A. 11-187.]

Page 339 Note 3 Berman, H., Ibid., 1937, vol. 22, p. 342.Google Scholar Same work quoted by Palache, C., Prof. Paper U.S. Geol. Survey, 1935, no. 180, p. 113.Google Scholar [M.A. [6-261.]

Page 340 Note 1 Larsen, E. S., Amer. Journ. Sci., 1917, vol. 43, p. 464.CrossRefGoogle Scholar [M.A. 1-206.] The material was originally described as 'eakleite' and was later shown to be xonotlite (Larsen, loc. cit., 1923).

Page 341 Note 1 Berman, H., Amer. Min., 1937, vol. 22, p. 342.Google Scholar Same work quoted by Palache, C., Prof. Paper U.S. Geol. Survey, 1935, no. 180, p. 113.Google Scholar [M.A. 6-261.]

Page 341 Note 2 Rammelsberg, C. F., Zeits. Deutsch. Geol. Gesell., 1866, vol. 18, p. 33.Google Scholar The original spelling was 'xonaltit'.