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The oriented transformation of aragonite into calcite

Published online by Cambridge University Press:  14 March 2018

D. R. Dasgupta
D. R. Dasgupta*
Affiliation:
Geological Survey of India, 29 Chowringhee, Calcutta 16, India
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Summary

The oriented transformation of aragonite to calcite has been studied by X-rays. The [100], [110], and [001] directions of aragonite become [101̄0], [011̄0], and [0001] of calcite. The transformation was completed by a re-orientation of the CO3 groups about the [001] direction of aragonite through an angle of 30°, different rows of CO3 being turned in opposite directions, together with a displacement along the same direction. The layers of Ca ions also are shifted along the basal plane of calcite so that their arrangement perpendicular to the [0001] direction of calcite becomes ABCABCA… instead of ABABABA… as in aragonite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 265 , June 1964 , pp. 924 - 928
Copyright
Copyright © 1964, The Mineralogical Society

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