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Crystalline forms of Carbides and Silicides of Iron and Manganese (‘Ferro-manganese,’ &c.).

Published online by Cambridge University Press:  14 March 2018

L. J. Spencer
L. J. Spencer*
Affiliation:
Mineral Department of the British Museum
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Extract

Mallard in 1879, noted that crystals of the metallurgical products ‘Spiegeleisen’ and ‘ferro-manganese’ are of two kinds. Both show a prism-zone of six faces, but when the percentage of manganese reaches a certain amount there is an abrupt change in the habit of the crystals and in the angles between their faces. Crystals containing from 11 up to 52 or 55 per cent. of manganese are lamellar, and were found to have a prism-angle (mm′′′ = 110 : 11̄) of 6° 27′, while crystals containing a larger amount of manganese are acicular and have a pseudo-hexagonal prism-zone, the angular measurements of which varied between 58° 42′ and 61° 20′.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 13 , Issue 61 , February 1903 , pp. 296 - 302
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1903

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References

Page 296 note 1 Mallard, E., Sur la forme cristalline du ferromanganèse. Bull. Soc. Min. de France, 1878, vol. ii, pp. 47–50 Google Scholar.

Page 296 note 2 Rathke, B., Ueber krystallisirtes Ferromangan. Liebig's Annalen der Chemic, 1890, vol. cclx, pp. 326-32CrossRefGoogle Scholar. [With crystallographic determinations by R. Brauns.]

Page 296 note 3 This angle, 68° 5′, is the mean of readings which varied between 67° 40′ and 68° 30′. It is given by Brauns as the angle bm, since it was repeated four times on the same crystal ; this repetition may, however, be explained by twinning on a prism plane.

Page 298 note 1 Stead, J. E., Crystals of carbo-silicide of manganese and iron. Journ. Iron and Steel Institute, 1901, No. 1, vol. lix, pp. 79–88 Google Scholar. Here fig. 2 incorrectly represents the crystals as orthorhombic with inclined hemihedrism.

Page 301 note 3 Verhandl. russ.-kais, mineral. Gesell. St. Petersburg, 1879, ser. 2, vol. xiv, p. 246. A German abstract of this note is given in Zeits. Kryst. Min., 1879, vol. iii, p. 438, under the title : P. von Jeremejew. Krystalle des Ferromangansiliciums.

Page 302 note 1 Archivos do Museu Nacional do Rio de Janeiro, 1896, vol. ix, pp. 130, 160.

Page 302 note 2 Meddelelser om Grønland, 1897, vol. xv, p. 293; Ann. k. k. naturhist. Hofmuseums, Wien, 1897, vol. xii, p. 58.

Page 302 note 3 Tabellar. Uebersicht der Mineralien, 4th edit., p. 16. Braunschweig, 1898.