mineral

Blue apatite

Apatite-group phosphate, commonly fluorapatite (Ca5(PO4)3F)

AI-generated identification · may be incorrect

Vivid blue, translucent to opaque crystal aggregate with vitreous-to-resinous luster and uneven fracture; Mohs hardness 5, hexagonal crystal system, poor cleavage, and specific gravity about 3.1–3.2.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms in igneous pegmatites, alkaline rocks, hydrothermal veins, and some metamorphic deposits; individual crystals may be geologically ancient, commonly Precambrian to younger. The specimen appears rough and natural, though exact identification would require testing.

Uses & applications

Used mainly as a collector mineral and occasionally as a gemstone; phosphate-rich apatite is important industrially for fertilizer and phosphoric acid. Gem-quality blue apatite can be faceted but is relatively soft and brittle.

Geological facts

Its name derives from Greek apatē, “deceit,” because it can resemble several other blue minerals. Strong blue color is often associated with trace elements or irradiation treatment.

Field identification & locations

Common localities include Madagascar, Brazil, Mexico, Canada, and Myanmar. Distinguish it from turquoise and beryl by its hardness, crystal habit, heft, and lack of turquoise’s waxy appearance; acid, hardness, and refractive-index tests confirm it.