Article | REF: C910 V1

Plaster

Author: Daniel DALIGAND

Publication date: May 10, 2002

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1. Gypsum and anhydrite

Calcium sulfate is found in nature in two main forms:

  • hydrated with two molecules of water per molecule of calcium sulfate (CaSO 4 . 2H 2 O): this is gypsum ;

  • anhydrous (CaSO 4 ): this is anhydrite.

It can also be found, in certain specific geological situations, hydrated with a fraction of one water molecule per molecule of calcium sulfate: this is bassanite (CaSO 4 . 1/2 H 2 O), metastable under normal conditions and only found in small quantities (less than 1% by mass) in gypsum.

Gypsum and anhydrite also exist as by-products...

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Gypsum and anhydrite