Issue 28, 2022

Epitaxies of Ca-sulfates on calcite (CaCO3) I. Gypsum {010} on the calcite {10.4} form: epi-twins of gypsum induced by the calcite substrate

Abstract

3D-epitaxy of the {010} pinacoid of deposited gypsum (CaSO4·2H2O) on the substrate {10.4} calcite rhombohedron is described, in order to give a theoretical background to the replacement of calcite with gypsum both in the laboratory and by weathering in nature. 2D-lattice coincidences are geometrically obtained from the matching of periodic bond chains (PBCs) running within the elementary slices facing towards the substrate/deposit interfaces. The epitaxy in the third dimension, perpendicular to the interfaces, has been verified as well, to establish if ad/absorption occurs (anomalous mixed crystals) at the calcite/gypsum contact. This research represents the reticular part of a wider program extended to the epi-interaction among the gypsum/calcite, gypsum/bassanite (CaSO4·1/2H2O) and gypsum/anhydrite (CaSO4) couples.

Graphical abstract: Epitaxies of Ca-sulfates on calcite (CaCO3) I. Gypsum {010} on the calcite {10.4} form: epi-twins of gypsum induced by the calcite substrate

Supplementary files

Article information

Article type
Paper
Submitted
11 Apr 2022
Accepted
07 Jun 2022
First published
07 Jun 2022
This article is Open Access
Creative Commons BY-NC license

CrystEngComm, 2022,24, 5120-5127

Epitaxies of Ca-sulfates on calcite (CaCO3) I. Gypsum {010} on the calcite {10.4} form: epi-twins of gypsum induced by the calcite substrate

D. Aquilano, M. Bruno, A. Cotellucci, L. Pastero and S. Ghignone, CrystEngComm, 2022, 24, 5120 DOI: 10.1039/D2CE00508E

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