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Note on a connexion between the molecular volume and chemical composition of some crystallo-graphically similar minerals

Published online by Cambridge University Press:  14 March 2018

G. T. Prior
G. T. Prior*
Affiliation:
Mineral Department of the British Museum
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Extract

The molecular volumes of the members of an isomorphous group of minerals in general show an approach to equality. In other words, minerals having an analogous chemical composition show not only closely related crystalline forms, but have also approximately equal molecular volumes. Many years ago J. D. Dana endeavoured to show that a simple relationship as regards molecular volume also subsisted in the case of various minerals which were closely related crystallographically, although unlike chemically. He concluded that in these cases the similarity in form depended solely on the relationship in molecular volume, and had nothing whatever to do with the chemical composition.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 13 , Issue 61 , February 1903 , pp. 217 - 223
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1903

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References

Page 217 note 1 Amer. Journ. Sci., 1850, ser. 2, vol. ix, p. 220.

Page 217 note 2 V = molecular volume, i. e. molecular weight divided by tile density.

Page 218 note 1 Amer. Journ. Sci., 1902, ser. 4, vol. xiv, p. 211 ; and Zeits. Kryst. Min., 1902, vol. xxxvi, p. 545.

Page 218 note 2 Plumbogummite is left out of account owing to the lack of crystallographic data.

Page 218 note 3 The presence of strontia with lime in the mineral from Horrsjöberg has been determined by testing in the same way as in the case of the Westanå mineral (see previous paper, l.c., p. 252).

Page 218 note 4 Arzruni, A. and Thaddéeff, K., Zeits. Kryst. Min., 1899, vol. xxxi, pp. 234, 244Google Scholar.

Page 219 note 1 von Sustschinsky, p., Zeits. Kryst. Min., 1902, vol. xxxvii, p. 57 Google Scholar ; abstract this vol., p. 307.

Page 220 note 1 Penfield's determination for brookite from Magnet Cove, Arkansas. Amer. Journ. Sci., 1886, set. 3, vol. xxxi, p. 387.

Page 220 note 2 Headden's determination for tantalite from Dakota, S.. Amer. Journ. Sci., 1891, ser. 8, vol. xli, p. 98 Google Scholar.

Page 221 note 1 Hillebrand's determination for hübnerite from Ouray Co., Colorado. Amer. Journ. Sci., 1884, ser. 8, vol. xxvii, p. 357.

Page 221 note 2 Zeits. Kryst. Min., 1884, vol. ix, p 483.