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Observations on the alteration products of stibnite

Published online by Cambridge University Press:  14 March 2018

W. R. Schoeller
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Extract

In the mineralogical literature, stibnite is usually stated to change by oxidation into kermesite and finally into valentinite or senarmontire. Another alteration product is described as antimony ochre, a term loosely applied to several minerals, viz. cervantite, stibiconite, and volgerite (Dana, System of mineralogy, 6th edit., 1892, p. 203).

In my metallurgical experience with stibnite ores, I have never met with kermesite or valentinite. Whenever I have encountered altered stibnite in ores from widely separated localities, it showed a yellowish to buff coating which I took to be cervantite. After spending two years in central China where I examined hundreds of tons of stibnite ores from Hunan province, I had to purchase a specimen of kermesite from a mineral dealer in order to become acquainted with the mineral. The locality of the specimen was given as Bräunsdorf, Saxony.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 26 , Issue 174 , September 1941 , pp. 94 - 96
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1941

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References

Note

page 94 note 1 Schoeller, W. R., Notes on Chinese antimony ores, crude and regulus. Journ. Soc. Chem. Industry, London, 1913, vol. 32, pp. 260–262.CrossRefGoogle Scholar Oxygen and metallic antimony in crude antimony. Ibid., 1914, vol. 33, pp. 169–170. In the liquated sulphide produced in Hunan, sulphur was found to be too low for Sb2S3, and oxygen was determined by fusing the material in a current of dry H2S and weighing the water formed.