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On Schwartzembergite1

Published online by Cambridge University Press:  14 March 2018

G. F. Herbert Smith  and
G. T. Prior
G. F. Herbert Smith
Affiliation:
Mineral Department of the British Museum
G. T. Prior
Affiliation:
British Huseum
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Extract

The mineral schwartzembergito was first described by Domeyko in 1864 as an oxychloroiodide of lead from the Desert of Atacama. The specimens, which are said to have been collected about ten leagues from Paposo in the Desert of Atacama, at a mine worked for argentiferous galena, were brought to his notice by Dr. Schwartzemberg, an assayer at Copiapo, who had recognized the material as being an iodide of lead. Domeyko made a chemical analysis (see p. 82) of the mineral, a yellowish crust, 1 to 2 mm. in thickness, upon galena, and obtained the formula, 2Pb(CI,I)2.3PbO, the specific gravity being 5.7; no crystal measurements were obtainable, neither were any optical observations made.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 16 , Issue 74 , October 1911 , pp. 77 - 83
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1911

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Footnotes

1

Communicated by permission of the Trustees of the British Museum.

References

Page 77 note 2 Domeyko, I., Annales des Mines, 1864, ser. 6, vol. v, p. 453 Google Scholar.

Page 77 note 3 One Spanish league is nearly equal to four English miles.

Page 77 note 4 This is the modern form ; Domeyko wrote the formula as 2Pb(Cl2.I)3PbO.

Page 77 note 5 Liebe, K. T., Neues Jahrb. Min., 1867, pp. 159–164 Google Scholar.

Page 78 note 1 The formula was given in the old form PbI. 2PbO.

Page 78 note 2 Domeyko, I., ‘Mineralojia,’ 8rd edit., Santiago, 1879, pp. 319–321 Google Scholar.

Page 78 note 3 Bertrand, É., ‘Étude optique de différents minéraux,’ Bull. Soc. Min. de France, 1881, vol. iv, p. 87 Google Scholar.

Page 78 note 4 In an editorial note it is stated, ‘. . . . the last-named [schwartzembergite] being in well-developed tetragonal crystals.’ Mineralogical Magazine, 1903, vol. xiii, p. 382.

Page 79 note 1 Smith, G. F. H., ‘A camera lucida attachment for the goniometer,’ Mineralogical Magazine, 1910, vol. xv, pp. 388–389 CrossRefGoogle Scholar.