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Description of large crystals of Seligmannite and Dufrenoysite1
Published online by Cambridge University Press: 14 March 2018
Extract
In the summer of 1906 some large crystals of seligmannite were found in an irregular, elongated cavity in the dolomite-rock of the Lengenbach quarry at Binn, Switzerland. Owing to their brittle nature many of them were broken when the rock was blasted, but I was in the quarry at the time and collected all the fragments. The largest crystal broke after it had been measured, and Dr. G. T. Prior's analysis II was made on portions of it, his other analysis, I, being made on measured crystal fragments found with the large crystal. The streak of the present crystals is black and inclined to purplish in colour, while that of the crystals first described by me was chocolate-coloured.
- Type
- Research Article
- Information
- Mineralogical magazine and journal of the Mineralogical Society , Volume 16 , Issue 76 , December 1912 , pp. 282 - 286
- Copyright
- Copyright © The Mineralogical Society of Great Britain and Ireland 1912
Footnotes
1
The drawings illustrating this paper were prepared by Dr. G. F. Herbert Smith. In order to identify certain of the faces he measured the smaller crystals on the three-circle goniometer in the British Museum and found a few additional new forms on the second crystal of dufrenoysite, which have been incorporated in the list given on p. 286.
References
Page 282 note 1 Prior, G. T., Mineralogical Magazine, 1910, vol. xv, p. 885 Google Scholar, where, through a misunderstanding, it was stated that the analysis was made on fragments of another crystal, which had been found by me in 1905, and described in Mineralogical Magazine, 1906, vol. xiv, p. 186.
Page 282 note 2 Solly, R. H., Mineralogical Magazine, 1908, vol. xiii, p. 837 Google Scholar.
Page 283 note 1 Registered number 1906, 411.
Page 284 note 1 The calculated values are based upon the data given in my previous paper. Mineralogical Magazine, 1903, vol. xiii, p. 886.
Page 284 note 2 Baumhauer, H., Zeits. Kryst. Min., 1897, vol. xxviii, p. 551 Google Scholar.
Page 284 note 3 Registered number 1912, 144.
Page 284 note 4 Twinned crystals of dufrenoysite have not before been described. The first was found by me in the Lengenbach quarry in 1906, and is now in the British Museum collection (Registered number 1906, 412).
Page 285 note 1 Registered number 1912, 542.
Page 286 note 1 Selly, R. H., Mineralogical Magazine, 1902, vol. xiii, pp. 160–171 Google Scholar. In the list of forms on p. 165 four—(221), (432), (211), (412)—were omitted, and the number of forms was 103 and not 99 as there stated.
Page 286 note 2 Based on the data given on p. 162, loc. cit.