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The cell dimensions and space-group of pinnoite

Published online by Cambridge University Press:  14 March 2018

H. P. Stadler
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Extract

Pinnoite, first described by Staute in 1884, is straw-yellow, granular to faintly fibrous. It occurs in the upper kainite layers at Stassfurt, and is found associated with earthy boracite from which it is freed by washing with water. The analysis corresponds to the formula MgO.B2O3.3H2O, and Staute assumes the mineral to be an alteration product of boracite, 6MgO.MgCl2.8B2O3. Groth classes pinnoite together with CaO.B2O3 as a hydrated metaborate. This assumption does not seem justified, as will be pointed out later.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 196 , March 1947 , pp. 26 - 28
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1947

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References

page note 26 1 Staute, H., Ber. Deutsch. Chem. Gesell., 1884, vol. 17, part 2, p. 1584.CrossRefGoogle Scholar

page note 26 2 Groth, P., Chemische Krystallographie. Leipzig, 1908, vol. 2, p. 735.Google Scholar

page note 26 3 Luedecke, O., Zeits. Naturwiss. Halle, 1885, vol. 58, p. 646.Google Scholar

page note 27 1 Buerger, M. J., X-ray crystallography. New York, 1942, p. 394.Google Scholar

page note 27 2 The conversion factor used being 1 kX = 1·00202 Å.

page note 27 3 Larsen, E. S. and Berman, H., Microscopic determination of nonopaque minerals. Washington, 1934, p. 70.Google Scholar

page note 27 4 Zachariasen, W. H. and Ziegler, G. E., Zeits. Krist., 1932, vol. 83, p. 354. [M.A. 5–316.]Google Scholar