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Curvature of gypsum crystals induced by growth in the presence of impurities

Published online by Cambridge University Press:  05 July 2018

Caterina Rinaudo ,
Marinella Franchini-Angela  and
Roland Boistelle
Caterina Rinaudo
Affiliation:
Dipartimento di Scienze della Terra, Via S. Massimo 24, 10123 Torino, Italy
Marinella Franchini-Angela
Affiliation:
Dipartimento di Scienze della Terra, Via S. Massimo 24, 10123 Torino, Italy
Roland Boistelle
Affiliation:
Centre de Recherche sur les Mécanismes de la Croissance Cristalline, Campus Luminy, Case 913, 13288 Marseilte Cedex 9, France
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Abstract

Gypsum crystals were grown at 25, 35, and 45 °C from solutions containing different ionic impurities (Mg2+, Na+, Cd2+). Curved gypsum crystals formed from the solutions enriched in magnesium or cadmium, whereas, in the presence of sodium, gypsum always grew undeformed. The mechanism of the curvature is described and an interpretation based on crystallographic considerations is given. Curvature is the result of impurity incorporation followed by crack formation and mechanical twinning which releases the internal stresses.

Keywords

gypsumcurved crystalsmechanical twinsimpurity absorption
Type
Mineralogy
Information
Mineralogical Magazine , Volume 53 , Issue 372 , September 1989 , pp. 479 - 482
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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