The identity of jurupaite and xonotlite
Published online by Cambridge University Press: 14 March 2018
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
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'.
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