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On Teallite, a new sulphostannite of lead from Bolivia ; and its relations to Franckeite and Cylindrite

Published online by Cambridge University Press:  14 March 2018

G. T. Prior
G. T. Prior*
Affiliation:
British Museum
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Extract

Amongst the specimens recently selected for the British Museum from the collection of South American minerals brought together by the late Theodor Hohmann, are two on which occurs a mineral in thin laminae resembling graphite. From the locality and associations, the mineral was at first presumed to be either franckeite or cylindrite, the two sulphantimonite-sulphostannates of lead from Bolivia, which were described in 1893 by Stelzner and Frenzel respectively. Qualitative analysis, however, soon showed that, although similar to them in physical characters, it differed chemically from both franckeite and cylindrite in containing no antimony, but only lead, tin, and sulphur.

Of the two specimens from the Hohmann collection, one was labelled ‘sulphoselenide of lead from Bolivia,’ and the other ‘selenide of lead from Atacama,’ so that unfortunately the precise locality of the mineral is at present unknown. In all probability both specimens came from the same district in Bolivla, since in appearance they are very similar.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 14 , Issue 63 , October 1904 , pp. 21 - 27
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1904

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References

Page 21 note 1 Neues Jahrb. Min., 1893, vol. ii, pp. 114 and 195.

Page 21 note 2 For kind initiation into the manipulation of this instrument I am indebted to Mr. Herbert Smith.

Page 23 note 1 The atomic weights used throughout this paper are the ‘International Atomic Weights’ for 1904, with O = 16. Weights used in analyses, 0.6348 gram in I, and 0.3929 gram in II ; for sulphur determinations, 0.2752 gram in I, and 0,2658 gram in II.

Page 23 note 2 In I the tin was determined as oxide by the direct ignition of the sulphide and is possibly a little too high ; in II, in order to test for traces of antimony, the sulphide was converted into oxide by means of nitric acid and a slight loss may have occurred. The mean value given above is therefore probably not far from the truth.

Page 24 note 1 Weight used in analysis III, 0.5494 gram ; for sulphur determination, 0.2179 gram.

Page 25 note 1 Weight used ia analysis IV, 0.7185 gram; for sulphur determination, 0.2557 gram.

Page 26 note 1 Weights used in analyses, 0.5684 gram in VI, and 0.6659 gram in VII ; for sulphur determination, 0.2446 gram in VI, and 0.2289 gram in VII.