mineral

Apatite

Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))

Hardness: 5 on the Mohs scale, making it relatively soft. Color: Commonly blue, green, yellow, pink, purple, or colorless. The specimen appears to be blue apatite. Luster: Vitreous to sub-resinous. Crystal structure: Hexagonal prism, often with pyramidal terminations. Cleavage: Indistinct on one plane.…

Hardness: 5 on the Mohs scale, making it relatively soft
Color: Commonly blue, green, yellow, pink, purple, or colorless
Luster: Vitreous to sub-resinous

Identified October 25, 2025More mineral →

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Physical properties

Formation & geological history

Apatite forms in a variety of geological settings. It is a common accessory mineral in igneous rocks, sedimentary rocks (especially limestones and phosphorites), and metamorphic rocks. It can also be found in hydrothermal veins. The blue variety often occurs in pegmatites or metamorphic limestones. Its formation is typically associated with the presence of phosphorus-rich solutions or melts over a wide range of geological ages, from Precambrian to recent.

Uses & applications

Apatite is the primary source of phosphorus for fertilizers, making it crucial in agriculture. High-quality transparent varieties are faceted for collectors, although its softness limits its use in mainstream jewelry. It is also used in the production of phosphoric acid and other phosphate-based chemicals. Hydroxylapatite is a major component of tooth enamel and bone, and synthetic forms are used in biomedical applications for bone grafts and dental implants.

Geological facts

The name 'Apatite' comes from the Greek word 'apatein', meaning 'to deceive', because it is often confused with other minerals like tourmaline, beryl, or olivine due to its varied color and crystal forms. It is considered a relatively soft gemstone and is therefore not recommended for everyday wear in jewelry. Despite its industrial importance, gem-quality apatite is quite rare.

Field identification & locations

Apatite can be identified in the field by its hexagonal crystal habit, relatively low hardness (easily scratched by a steel file), and vitreous luster. Its wide range of colors can make identification difficult without a hardness test. Blue apatite is often found in Brazil, Madagascar, Mexico, and Canada. Other significant localities include the USA, Myanmar, and Sri Lanka. Collectors often seek out well-formed crystals and unusual color variations. Remember its softness when handling to prevent scratches.

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Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

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Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

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