Gypsum crystals. Coloured scanning electron micrograph (SEM) of crystals of calcium sulphate dihydrate,or gypsum. Gypsum is used as plaster of Paris. It is a white rock that is ground to a fine powder and then heated until it has lost about three quarters of its water content. When this powder is mixed with water the paste dries to a rock-hard finish | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Gschmeissner, Steve |
Taille de l’image : | 2900 px × 2184 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |