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On the occurrence of the rare mineral Carminite in Cornwall

Published online by Cambridge University Press:  14 March 2018

Arthur Russell
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Extract

The mineral carminite was first described by F. von Sandberger in 1850 in a paper which appeared in Poggendorff's Annalen, entitled ‘Carminspath, ein neues Mineral aus der Ordnung der Arseniate’. It occurred near Horhausen, Rhenish Prussia, forming clusters of fine needles of a carmine- to tile-red colour, implanted on quartz, limonite, and beudantite, and accompanied by pyrolusite, clear crystals of mimetite, and an undetermined yellow, earthy mineral. In a subsequent paper in 1858, ‘Ueber den Carminspath,’ he gave the precise locality as the Luise mine, Horhausen, Rhenish Prussia ; and a quantitative analysis, on 0.068 gram by R. Müller, showed the mineral to be an anhydrous arsenate of iron and lead : As2O5, 49.11 ; Fe2O5, 30.29 ; PbO, 24.55 = 108.95. A trace of phosphoric acid was also present.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 15 , Issue 71 , March 1910 , pp. 285 - 287
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1910

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References

Page 285 note 1 von Sandberger, F., Ann. Phys. Chem. (Poggeudorff), 1850, vol. lxxx, pp. 391–392.CrossRefGoogle Scholar

Page 285 note 2 F. von Sandberger, ibid., 1858, vol. ciii, pp. 346-347.

Page 285 note 3 Hingston Down Consols mine commenced working about 1846, and was for many years a large producer of copper ores. After being abandoned for a long time, it was re-opened about 1904 by the Clitters United Mines Co. Ltd., since which date it has produced considerable quantities of tin, copper, wolframite, and arsenical pyrites, and also some fluor-spar. Thanks to the courtesy of the late manager, Captain J. Paull (now of South Crofty mine), Mr. Richards and myself were able to visit the mine on many occasions and collect the material described in this paper.

Page 287 note 1 The beudantite occurring with carminite at the Luise mine, Horhausen, was at first mistaken by Sandberger for pharmaeosiderite, but later (Ann. Phys. Chem. (Poggendorff), 1857, vol. c, p. 612) he showed its true nature. The Cornish mineral was examined by the writer, and is undoubtedly pharmacosiderite.