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X-ray studies on pyrolusite (including polianite) and psilomelane

Published online by Cambridge University Press:  14 March 2018

George Vaux
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Extract

One of the most promising uses of X-ray diffraction methods in mineralogy is the study of those minerals which are opaque and whose crystals are extremely minute. Although recent methods of ore examination by reflected polarized light have given valuable information about these substances, their application to soft, powdery materials is extremely difficult, an objection which does not apply to X-ray methods.

Pyrolusite (including polianite).—The present study had for its main objective an attempt to settle, by X-ray examination , the uncertainty existing as to the relationship between polianite and pyrolusite, Work already carried out by St. Johns has suggested that polianite and pyrolusite are identical, since they have the same cell sides as found from powder photographs.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 24 , Issue 157 , June 1937 , pp. 521 - 526
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1937

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References

Page 521 note 1 Johns, A. St., Physical Rev., 1923, vol. 21, p. 389.Google Scholar

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Page 522 note 1 Dana, E. S. and Penfield, S. L., Amer. Journ. Sci., 1888, ser. 3, vol. 35, p. 243.CrossRefGoogle Scholar X-ray photographs were obtained from the specimen, a crystal from which is figured in Dana, Syst. Min., 6th edit'., 1892, p. 236, fig. 1. In addition, identical X-ray photographs were obtained from B.M. 21987, also from Platten, in the British Museum collection.

Page 522 note 2 Haidinger, W., Trans. Roy. Soc. Edinburgh. 1831, vol. 11, p. 136.Google Scholar A portion of the type specimen, B.M. 91106, was fortunately available in the British Museum collection, and was photographed.

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