mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

AI-generated identification · may be incorrect

Hardness: 5 (Mohs scale); Color: Neon to teal blue, sometimes with green undertones; Luster: Vitreous to sub-resinous; Crystal structure: Hexagonal; Cleavage: Poor; Specific gravity: 3.16–3.22

Hardness: 5 (Mohs scale)
Color: Neon to teal blue, sometimes with green undertones
Luster: Vitreous to sub-resinous

Identified March 15, 2026More mineral →

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Physical properties

Hardness: 5 (Mohs scale); Color: Neon to teal blue, sometimes with green undertones; Luster: Vitreous to sub-resinous; Crystal structure: Hexagonal; Cleavage: Poor; Specific gravity: 3.16–3.22

Formation & geological history

Formed as a common accessory mineral in igneous rocks, pegmatites, and metamorphic rocks (marble/schist). Specimens like this are often associated with crystalline pegmatite environments spanning millions of years in geological age.

Uses & applications

Primarily used as a minor gemstone for jewelry and a popular mineral specimen for collectors. Industrially, apatite is a source of phosphorus for fertilizer production.

Geological facts

Apatite is the specific mineral that defines the '5' on the Mohs scale of mineral hardness. Its name is derived from the Greek word 'apate', meaning 'to deceive', because it was historically confused with other minerals like tourmaline and beryl.

Field identification & locations

Identify by its characteristic blue-green hue and glassy luster. It can be scratched by a steel knife but not by a copper penny. Commonly found in Madagascar, Brazil, and Mexico. Collectors should avoid harsh cleaners as it is chemically sensitive.