In chemistry, a hemihydrate (or semihydrate) is a hydrate whose solid contains one molecule of water of crystallization per two other molecules, or per two unit cells.
This is sometimes characterized as a solid that has one "half molecule" of water per unit cell.
[1] An example of this is calcium sulfate hemihydrate (CaSO4·0.5H2O or 2CaSO4·H2O), which is the hemihydrate of calcium sulfate (CaSO4).
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