MARTIN LAND / SCIENCE PHOTO LIBRARY MARTIN LAND / SCIENCE PHOTO LIBRARY
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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