Calcite crystals. These crystals are formed from calcium carbonate (CaCO3),the main constituent of limestone and marble. Calcite crystals (or calcspar) are typically hexagonal-rhombohedral,a structure that can create birefringence (double refraction),an optical property where objects viewed through a crystal have a two images. These crystals also glow under ultraviolet light | |
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Crédit: | Science Photo Library / Land, Martin |
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