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On the chemical classification of the mica group. III. The molecular volumes

Published online by Cambridge University Press:  14 March 2018

A. F. Hallimond
A. F. Hallimond*
Affiliation:
Museum of Practical Geology, London1
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Extract

It is unfortunate that so many published analyses of mica are not accompanied by the physical data for the material used. Nevertheless, enough information is available to permit a general comparison of the density relations for the group. This is most conveniently made in terms of the specific volume, for, in most isomorphous series, the volume is an additive property eveu when the molecular volumes of the endminerals differ appreciably. Such a relationship will be shown to hold good approximately for the micas; the volume can be calculated from constants assigned to the constituent oxides, the difference from the observed value being rarely more than 2 per cent.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 21 , Issue 116 , March 1927 , pp. 195 - 204
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1927

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References

page 196 note 1 Min. Mag.. 1925, vol. 20, pp. 305-318, and 1926, vol. 21, pp. 25-33. Figures 1-5page and Tables I-IV were given in those parts.

page 198 note 1 See Part I of this paper, p. 317.

page 199 note 1 Genth, F. A., Amer. Journ. Sci., 1892, ser. 3, vol. 44, p. 388; Japan Google Scholar.

page 199 note 8 A. G. Hall, Victoria Mines Report for 1908, 1909, p. 66; Coolgardie.

page 199 note 3 Simpson, E. S. in Winchell, A. N., Amer. Journ. Sci., 1925, ser. 5, vol. 9, p. 424 ; Coolgardie.Google Scholar

page 199 note 4 C. G. Gibson in A. N. Winchell, ibid., Coolgardie, Western Australia.

page 203 note 1 H. Rosenbusch (A. Osann), ‘ Gesteinslehre', 5th edit., 1923-24, p. 224. ‘ Wodanite.’ The other two analyses are given in the 3rd edition, 1910, p. 201. [Min. Abstr., vol. 2, p. 11.] It will be noted that these micas have an abnormally low content of water.

page 203 note 2 Dana's ‘System', 1892, p. 719. Small amounts of CaO, &c., are omitted.