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Sulpharsenites of Lead from the Binnenthal1. Part III.—Baumhauerite, a new mineral; and Dufrenoysite

Published online by Cambridge University Press:  14 March 2018

R. H. Solly  and
H. Jackson
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Extract

For this new mineral I propose the name baumhauerite in honour of Dr. H. Baumhauer, Professor of Mineralogy in the University of Freiburg, Switzerland, who has done so much to elucidate this complicated group of sulpharsenites of lead.

System: Oblique. a : b : c = 1.136817 : 1 : 0.947168; β = 82° 423/4.

These elements are calculated from the angles 100 : 101=50° 27′ 101:001 = 32° 153/4′ and 010 : 111̄ = 50° 33′ measured on crystal No. I.

The crystals closely resemble dufrenoysite and jordanite in appearance. They may be distinguished from dufrenoysite by the marked oblique development of the zone [100,001], and from jordanite by the absence of twin striations and by the colour of the streak. The edges in the pyramid zone and between planes in the zone [100,010] are more or less rounded.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 13 , Issue 60 , May 1902 , pp. 151 - 171
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1902

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Footnotes

Page 151 note 1

Part I.—General Description and Chemical Analyses, with a Crystallographic account of Jordanita. This Magazine, 1900. vol. xii, pp. 282-97. Part II.—Rathite. This Magazine, 1901, vol. xiii. pp. 77-845. Theae two parts have been published together in Zeite. Kryst. Min., 1901, vol. xxxv, pp. 821-44.

References

Page 151 note 2 A preliminary notice of this new mineral was pubUahed in ‘Nature,’ Oct. 10, 1901, vol. lxiv, p. 577, but no name was then given to it.

Page 153 note 1 Measurement of a crystal which had been labelled as dufrenoysite in the British Museum gave angle agreeing with thole of baumhauerite.—L. J. S.

Page 160 note 1 This formula, 4PbS.3As2S3, has previously been assigned by Jackson to the new Binnenthal mineral liveingite of which I have given a preliminary description in Proc. Cambridge Phil. Soc., 1901, vol. xl, p. 239. The analysis of liveingite agrees, however, more closely with the formula 5PbS.4As2S3.

Page 161 note 1 Fig. 2, plate vii of the memoir quoted above.