Blue Apatite

Physical Properties

Hardness: 5 Mohs; Color: Teal to deep blue; Luster: Vitreous to sub-resinous; Crystal structure: Hexagonal; Cleavage: Poor; Specific gravity: 3.16 to 3.22

Formation & Geological History

Formed in igneous pegmatites, metamorphic rocks (marble), and sedimentary phosphate beds. Found in geological environments rich in phosphorus.

Uses & Applications

Primarily used in the production of phosphorus fertilizers; also used as a gemstone for jewelry, in lapidary work, and as a mineral specimen for collectors.

Geological Facts

Apatite is the mineral that makes up the tooth enamel and bones of most mammals; the name is derived from the Greek word 'apate', meaning deceit, because it is often confused with other minerals like tourmaline and beryl.

Field Identification & Locations

Identify by its characteristic blue-green color and hexagonal crystal habit when not tumbled; its hardness of 5 is a key diagnostic tool. Commonly found in Madagascar, Brazil, and Mexico.

Identified on: 5/15/2026

Mode: Standard