PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Selenite crystals. Selenite, a variant of gypsum (calcium sulphate), is a common and abundant mineral throughout the world. Gypsum forms some of the largest crystals found in nature and is commonly found in sedimentary rock. It has a wide range of applications in industry, including for construction materials and food additives. This sample, from France, is 10 centimetres wide.
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