Description: Optical calcite is a transparent form of calcite which is, chemically speaking, calcium carbonate. Calcite belongs to the calcite group of minerals, a group of related carbonates that are isomorphous with one another. The natural citrine quartz is offered for decorative purposes, suitable for home, office desk. Please, handle your stones with great care, do not grind or crumble them. Perfect for home decor, planting pot, degaussing, aquarium, fish tank, etc.