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Ephesite (soda-margarite) from the Postmasburg district, South Africa

Published online by Cambridge University Press:  14 March 2018

F. Coles Phillips
F. Coles Phillips*
Affiliation:
Corpus Christi College, Cambridge
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Extract

The material on which the following description is based was presented by Dr. A. L. Hall to the Department of Mineralogy at Cambridge, and I am greatly indebted to him and to Prof. A. Hutchinson for affording me the opportunity of describing it. The first account of the occurrence was given by Dr. Hall, recording from Aarkop, Magoloring, 'a beautiful delicately rose-coloured mica … in compact dark bluish-grey ore as thick, short, colmnnar aggregates not unlike little books of mica with pseudo-hexagonal outlines and showing the characteristic perfect basal cleavage … the mate: rial was found on the higher slopes defining the west side of Martha's Kloof'. This description was amplified somewhat in a later publication, with the addition of an analysis (see below). As noted therein the mineral also resembles that described by Chudoba as a manganophyllite allied to the phlogopite group, but the fuller description given below reveals important differences.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 22 , Issue 132 , March 1931 , pp. 482 - 485
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1931

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References

page 482 note 1 A. L. Hall, The manganese deposits near Postmasburg, west of Kimberley. Trans. Geol. Soe. South Africa, 1927, vol. 29 (for 1926), p. 36. [Min. Abstr., vol. 3, p. 397.]

page 482 note 2 Nel, L. T., The geology of the Postmasburg manganese deposits and the surrounding country. Geological Survey of South Africa, Pretoria, 1929, p. 81.Google Scholar [Min. Abstr., vol. 4, p. 232.]

page 482 note 3 K. Chudoba, Über ‘Mangandiaspor’ und Manganophyll von Postmasburg (Griqualand-West, Südafrika). Centr. Min., Abt. A., 1929, p. 17. [Min. Abstr., vol. 4, p. 148.]

page 484 note 1 W. L. Bragg, The structure of silicates. Zeits. Krist., 1930, vol. 74, p. 271.

page 484 note 2 L. Pauling, Proc. Nat. Acad. Sci. U.S.A., 1930, vol. 16, p. 128. [Min. Abstr., vol. 4, p. 368.] Cf. W. L. Bragg, loc. cit., p. 272.

page 485 note 1 J. L. Smith, Amer. Journ. Sci., 1851, ser. 2, vol. 11, p. 59.

page 485 note 2 G. J. Brush, Appendix I to fifth edition of Dana's Mineralogy, 1888, p. 18.

page 485 note 3 F. A. Genth, Proc. Amer. Phil. Soc., 1873, vol. 13, pp. 387-390.

page 485 note 4 B. Silliman, Amer. Journ. Sci., 1849, ser. 2, vol. 8, p. 383. Corrected analysis in 3rd edition of Dana's System of Mineralogy, 1850, p. 362.