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Figure 5
Examples of natural gypsum contact twins in modern and ancient evaporitic environments. (a) Centimetre-sized gypsum twin from the Atacama Desert, Chile. (b) Centimetre-sized Messinian selenitic gypsum from Piedmont basin, Italy (photograph courtesy of Marcello Natalicchio). (c) Metre-sized Messinian selenitic gypsum from `Vena del Gesso Romagnola', Italy, composed of many sub-crystals obliquely elongated with respect to the twin plane (photograph courtesy of Piero Lucci).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 56| Part 3| June 2023| Pages 603-610
https://doi.org/10.1107/S1600576723002674
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