|Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite and chlorapatite.|
Apatite is a very soft (five on the Mohs scale) and heat sensitive gemstone. Brazil and Mexico have been the traditional sources of gem quality apatite.
| Madagascar is known to produce a neon blue-green material that is highly desired as a much cheaper substitute to Paraiba tourmaline. These electric colored stones have become by far the best known variety of this gem.|
While smaller stones in the one to 2 carat range are plentiful, neon apatite gemstones larger than 10 carats are very rare.
| Madagascar deposits were heavily mined for a decade and produced a lot of gem material. The deposit is now mined out.|
A rare variety is a rich purple from Maine. Blue Brazilian stones are also prized. Light-green apatite carries the trade name 'asparagus stone'.