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Figure 1
(a) Crystallographic structure of calcium sulfate hemihydrate (Ballirano et al., 2001BB8) along the c direction and SEM image of a typical α-hemihydrate crystal. (b) Crystallographic structure of calcium sulfate dihydrate (Boeyens & Ichharam, 2002BB11) along the c direction and SEM image of an aggregate of gypsum crystals of different sizes and shapes. The SEM images have been taken with a VEGA3 TESCAN scanning electron microscope with a voltage of 16 kV. Legend: blue balls – Ca atoms; yellow balls – S atoms; red balls – O atoms; white balls – water molecules.

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CRYSTALLOGRAPHY
ISSN: 1600-5767
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