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Published online by Cambridge University Press: 14 March 2018
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.
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
