mineral

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

AI-generated identification · may be incorrect

Hardness: 5 on Mohs scale; Color: Neon blue to teal-green; Luster: Vitreous (glassy); Crystal structure: Hexagonal; Cleavage: Poor; Specific gravity: 3.1–3.2

Hardness: 5 on Mohs scale
Color: Neon blue to teal-green
Luster: Vitreous (glassy)

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 5 on Mohs scale; Color: Neon blue to teal-green; Luster: Vitreous (glassy); Crystal structure: Hexagonal; Cleavage: Poor; Specific gravity: 3.1–3.2

Formation & geological history

Formed in igneous environments (pegmatites), metamorphic rocks, and occasionally in sedimentary deposits through phosphatic accumulation. It is found in deposits ranging from Precambrian to recent geological ages.

Uses & applications

Primary source of phosphorus for chemical fertilizers. High-quality specimens are used as gemstones in jewelry or as collector specimens.

Geological facts

Apatite is the defining mineral for level 5 on the Mohs scale of mineral hardness. The name is derived from the Greek word 'apatein', which means 'to deceive', because it was historically often mistaken for other gemstones like beryl or tourmaline.

Field identification & locations

Identify in the field by its distinct hexagonal crystal habit and its ability to be scratched by a steel blade but not by a copper penny. Commonly found in Madagascar, Brazil, and Mexico. Use caution when collecting; it is brittle and sensitive to heat.