Apatite is one of a few minerals produced and used by biological micro-environmental systems. Apatite is the defining mineral for 5 on the Mohs scale. Hydroxyapatite, also known as hydroxylapatite, is the major component of tooth enamel and bone mineral. Apatite is infrequently used as a gemstone. Transparent stones of clean colour have been faceted, and chatoyant specimens have been cabochon cut. Chatoyant stones are known as cat's-eye apatite, transparent green stones are known as asparagus stone, and blue stones have been called moroxite. Green Apatite is known to open the Heart Chakra with its high vibrational soothing energy, helping one work through traumas which have blocked the Heart Chakra. Green Apatite helps manifest abundance.