mineral

Blue apatite or dyed blue stone (likely apatite)

Apatite, Ca5(PO4)3(F,Cl,OH); exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

Opaque turquoise-blue, polished/tumbled surface with a vitreous to waxy luster and a visible natural seam or fracture. Apatite has Mohs hardness 5, hexagonal crystal structure, uneven fracture, and specific gravity about 3.1–3.2; color may be enhanced by dyeing or treatment.

Identified August 26, 2026More mineral →

Explore Blue apatite or dyed blue stone (likely apatite) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Natural apatite forms in igneous and metamorphic rocks, pegmatites, and phosphate-rich deposits, crystallizing over a wide range of geological ages. The rounded form is human-polished rather than naturally weathered.

Uses & applications

Used mainly as a collector specimen or ornamental stone; gem-quality apatite is faceted for jewelry but is relatively soft. If this is dyed calcite or another blue stone, its uses and properties differ substantially.

Geological facts

Bright blue apatite is often called “neon blue apatite,” especially material from Madagascar. A hardness test, specific-gravity measurement, and examination for dye concentration in cracks are needed for confirmation.

Field identification & locations

Common sources include Madagascar, Brazil, Mexico, and Canada; compare hardness and cleavage with turquoise, calcite, aragonite, and dyed quartz. Avoid harsh chemicals and ultrasonic cleaning because apatite scratches readily.