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Note on the spontaneous crystallization of drops of solutions as spherulites
Published online by Cambridge University Press: 14 March 2018
Extract
Previous experiments made by myself in the Oxford Mineralogical Laboratory on the crystallization of potash-alum had shown that a drop of supersaturated solution Of potash-alum, when left by itself, crystallized almost invariably in birefringent sphere-crystals, which represent a more soluble and less hydrated variety of that substance. It was further suggested (1) that the spontaneous crystallization of that particular substance always takes place as spherulites ; and (2) that this spherulitie growth is indicative of a sudden change in the solution, which is passing from the metastable state for ordinary alum (in which ordinary octahedra, when introduced, grow by themselves) to the labile state (in which the alum crystallizes as a rectangular network of needles).
- Type
- Research Article
- Information
- Mineralogical magazine and journal of the Mineralogical Society , Volume 15 , Issue 70 , July 1909 , pp. 224 - 231
- Copyright
- Copyright © The Mineralogical Society of Great Britain and Ireland 1909
References
Page 224 note 1 Chevalier, J., ‘On the crystallization of potash-alum.’ Min. Mag., 1906, vol. xiv, pp. 184–142.Google Scholar
Page 224 note 2 Lehmann, O., ‘Molekularphysik,’ 1888, vol. i, p. 388.Google Scholar
Page 224 note 3 McMahon, C. A., Min. Mag., 1893, vol. x, p. 229.CrossRefGoogle Scholar
Page 225 note 1 Miers, H. A. and Isaac, F., Journ. Chem. Soc., 1908, vol. xciii, p. 928.Google Scholar
Page 228 note 1 Rammelsberg, C. F., ‘Kryst.-Phys. Chemie,’ 1888, Abth. i, p. 408.Google Scholar
Page 230 note 1 SirBrewster, David, Trans. Roy. Soc. Edinburgh, 1853, vol. xx, p. 607.CrossRefGoogle Scholar
Page 230 note 2 Cf. my paper on potash-alum, loc. cit., p. 142.
Page 230 note 3 Miers, Cf. H. A., ‘Note on the crystallization of potassium bichromate.’ Min. Mag., 1908, vol. xv, p. 89.Google Scholar
Page 231 note 1 As with potash-alum, Min. Mag., 1906, vol. xiv, p. 139.
Page 231 note 2 As with sodium sulphate, cf. Hartley, H., Jones, B. M., and Hutchinson, G. A.. Journ. Chem. Soc., 1908, vol. xciii, p. 829 Google Scholar.