POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
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. Magnification x2180 at 10cm wide.
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