Optical Calcite, also known as Iceland Spar, is associated with cleavage crystals. Optical Calcite best demonstrates a unique characteristic of Calcite called double refraction. It doubles the image of whatever it is place upon and is said to assist people with eye problems. Each piece of Optical Calcite is approximately 60mm long and 60mm wide.
This product is sold per kilogram. A minimum of purchase of 250 grams is required.