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Plaqionite, Heteromorphite and Semseyite as Members of a Natural Group of Minerals

Published online by Cambridge University Press:  14 March 2018

L. J. Spencer  and
G. T. Prior
L. J. Spencer
Affiliation:
Mineral Department of the British Museum
G. T. Prior
Affiliation:
Mineral Department of the British Museum
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Extract

In a recent number of this Magazine (1897, XI. p. 192) a paper by me on "The Crystallography of Plagionite" gives the results of goniometric measurements and specific gravity determinations made on crystals of plagionite from Wolfsberg in the Harz; it was also suggested on crystallographic grounds that the mineral from Arnsberg in Westphalia described by Pisani as heteromorphite was identical with plagionite: but as no quantitative chemical analyses were made on the material measured, these results were not altogether satisfactory.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 12 , Issue 55 , April 1899 , pp. 55 - 68
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1899

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References

page 57 note 1 Rose, G., Pogg. Ann . 1833, XXVIII 421 Google Scholar.

page 57 note 2 The atomic weights used in this paper are those given by F. W. Clarke ('mlth. sonian Miscell. Collections, 1897,: No. 1075). Here Sb = 119"52 and Pb = 205'36, these being slightly lower than the wdues usually adopted. Previous to 1855. Sb was tahn as 129, which aeeounls for some of the differences in Ihe old formulae.

page 57 note 3 Comptes Rendus, 1876, LXXXIII. 747,

page 58 note 1 As a result of this the old jamesonite formula 3PbS.2Sb2S3 has been forgotten, but has turned up again under the later names warrenite and domingite! We are at present examining these minerals, and have already made an analysis of measured crystals of Bolivian jamesonite, which, as in previous cases with crystallised and cleavable jamesonite, does not give the formula 2PbS.Sb2S3.

page 59 note 1 Pisani (loc. cit.) describes the habit of the crystals as resembling that of mispickel, with an obtuse dome, or of adularia with c{001} and x{101}, with deeply striated summits and oblique striations on the prism faces. He also mentions that the system is probably monosymmetric.

page 61 note 1 In matted fibres, which are straight and not flexible; it contains lead, antimony and sulphur.

page 62 note 1 A Magyar tudomdnyos Akaddmia É"rlesitöje, Budapest, 1881, XV. 111-3. German abstracts are given in Zeits. Kryst. Min. 1884, VIII. 532-3, and Ungarische Revue, 1881, p. 367.

page 62 note 2 In fact, the specimens appear at one time to have been labelled as plagionite, since M. Tóth (Minerals of Hungry. Budapest, 1882, p. 385) gives plagionite from Felsöbánya, on the authority of the Hungarian National Museum.

page 62 note 3 The parameters and angles calculated by Dana from Krenner's three measured angles are here adopted.

page 63 note 1 Such globular aggregates of " plagionite " from Wolfsberg have already been described by Kenngott (sitz.-ber. Akad. Wien, 1855. XV. 236; XVI. 160). He also giveg figures illustrating the prismatic habit.

page 63 note 2 Taking the sp. gr. of bournonite to be 5"8, and estimating its volume (about lcc.) by measuring the size of the crystals, the sp. gr. of the semseyite is calculated as about 6.0.

page 64 note 1 G. Rose's parameters (Pogg. Ann. 1833, XXVIII. 421) are here given, since they were presumably determined on the same material as analysed by his brother, H. Bose. Luedeeke's (1883) measurements were not made on analysed material.

page 65 note 1 Pogg. Ann. XXVIII. 422. The two analyses were made on crystals from different specimens (Berzelius' Jehresber. 1835. XIV. 173; Pogg Ann. 1835, XXXV. 362).

page 65 note 2 Loc. cit. (a) Mean of three analyses on selected crystalline material; (b) on massive material, after deducting 7 per cent. of blende.

page 65 note 3 Rammelsberg's Handwörterb. chem. Min. 1847, 3rd Suppl., p. 44. This is the massive heteromorphite described by Zincken and Rammelsberg, Pogg. Ann. 1849, LXXVII. 240. Compare Rammelsberg's Handb. Min.-chem. 1860, p. 71, where different figures are given: a second analysis is given here, which agrees more closely with 2PbS.Sb2S3.

page 65 note 4 On crystals: Krenner (loc. cit) A more detailed account of this analysis is given by Sipöcz in Tscherm. Min. Mirth. 1886, VII. 283.

page 66 note 1 Min. Mag. 1896, XI. 137, 161.

page 67 note 1 Spencer, L. J., "Diaphorite from Washington and Mexico," Amer. J. Sci . 1898, VI 316 CrossRefGoogle Scholar.

page 67 note 2 Bult. Soc. Sci. Buearest, 1897, VI 179.