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. Issue 28 (30th June 2022)

• Record Type: Journal Article
• Authors: Aquilano, D.; Bruno, M.; Cotellucci, A.; Pastero, L.; Ghignone, S.
• Is Part Of: CrystEngComm. Volume 24:Issue 28(2022)
• Page Start: 5120
• Page End: 5127
• Publication Date: 2022-06-30
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d2ce00508e
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : 3D-epitaxy of the {010} pinacoid of deposited gypsum on {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. Abstract : 3D-epitaxy of the {010} pinacoid of deposited gypsum (CaSO4 ·2H2 O) 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 ·1/2H2 O) and gypsum/anhydrite (CaSO4 ) couples.