Abstract
A study by microscopy was made of the
dehydration and rehydration of grains and single crystals of gypsum. The
results confirm the view that, although dehydration of gypsum may be topotactic,
hydration of calcium sulphate hemihydrate is merely a matter of dissolution of
calcium sulphate hemihydrate, diffusion, nucleation (heterogeneous), and growth
of crystals of gypsum.��� Processes occurring during the dehydration of
gypsum are discussed, as are also theories for the hydration of calcium
sulphate hemihydrate. An equation accounting for the rate for the entire course
of hydration of calcium sulphate hemihydrate is discussed.
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19 articles.
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