Natural green apatite faceted pear drops briolette.Length is 4 Inches and Size 6 to 8mm approx. 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.