# How to identify apatite

Canonical page: https://lithomap.app/resources/mineral-identification/apatite
Last reviewed: September 17, 2026
Page purpose: Original LithoMap mineral identification reference for field observations, search systems, and language models.
Classification: Phosphate mineral group · Ca₅(PO₄)₃(F,Cl,OH)

## Summary

Apatite is a calcium phosphate mineral group used as Mohs hardness 5, commonly recognized by hexagonal crystals, glassy luster, variable color, and hardness between fluorite and feldspar.

## Quick identification clues

- Mohs hardness 5
- Hexagonal prismatic crystals are common
- Vitreous to resinous luster
- Often green, blue-green, brown, yellow, or colorless

## Composition and classification

Apatite-group minerals contain calcium phosphate with fluorine, chlorine, or hydroxyl in related end-member compositions. Natural specimens may contain substitutions and inclusions, so color does not identify the exact apatite species.

## Appearance

Apatite forms short to long six-sided prisms, tabular crystals, granular masses, nodules, and fine disseminated grains. Crystal ends may be flat, pyramidal, or modified by several faces.

Colors include green, blue, yellow, brown, violet, pink, gray, and colorless. Weathered or massive apatite can be dull and difficult to distinguish from other pale minerals.

## Identification tests

- Hardness: 5. Scratches fluorite but is scratched by feldspar and ordinary steel files.
- Cleavage: Poor to indistinct. Broken pieces usually do not show repeated perfect cleavage like fluorite.
- Crystal habit: Hexagonal prisms or tabular crystals. Useful on intact crystals but shared with beryl and some quartz forms.
- Streak: White. Consistent but not distinctive among pale nonmetallic minerals.

## Common lookalikes

- Fluorite: Softer at Mohs 4 and has four perfect cleavage directions that can yield octahedral fragments.
- Beryl: Harder at 7.5 to 8 and commonly forms more durable hexagonal prisms with longitudinal striations.
- Quartz: Harder at 7, lacks cleavage, and commonly has pointed pyramidal crystal terminations.

## Direct side-by-side comparisons

- Apatite vs. fluorite — https://lithomap.app/resources/mineral-identification/compare/apatite-vs-fluorite

## Most relevant related guides

- Fluorite — https://lithomap.app/resources/mineral-identification/fluorite
- Beryl — https://lithomap.app/resources/mineral-identification/beryl
- Quartz — https://lithomap.app/resources/mineral-identification/quartz
- Augite — https://lithomap.app/resources/mineral-identification/augite

## Formation

Apatite is an accessory mineral in many igneous and metamorphic rocks and can become concentrated in pegmatites, hydrothermal systems, and phosphate-rich sedimentary deposits.

Biological hard tissues also contain apatite-related calcium phosphate material, but fossil or bone identification requires context beyond a phosphate mineral test.

## Occurrence and geologic setting

Apatite is widespread as small accessory grains and occurs in economically important phosphate deposits, including sedimentary phosphorites and igneous phosphate bodies.

A visible apatite crystal does not demonstrate fertilizer-grade phosphate resources, gem quality, or a fossil-bearing unit.

## Uses and significance

Phosphate rock supplies phosphorus for fertilizer and chemical products. Transparent, well-colored apatite may be cut as a collector gemstone, but its moderate hardness limits wear durability.

## Field safety and limitations

- Use several hardness references because weathered surfaces can mislead.
- Do not use color to infer gem value or exact chemical end member.
- Avoid dust from phosphate rock and mine waste.

## Authoritative sources

- Phosphate Rock Statistics and Information — U.S. Geological Survey: https://www.usgs.gov/centers/national-minerals-information-center/phosphate-rock-statistics-and-information
- Minerals and their physical properties — U.S. National Park Service: https://www.nps.gov/subjects/geology/minerals.htm
- Mohs Hardness Scale — U.S. National Park Service: https://www.nps.gov/articles/mohs-hardness-scale.htm
- Natural Gemstones: Mineral Gemstones — U.S. Geological Survey: https://pubs.usgs.gov/gip/gemstones/mineral.html

## Specimen photograph

- Image: https://lithomap.app/_delivery/identification/minerals/apatite.webp
- Description: Large blue apatite crystal forming an imperfect hexagonal prism with pyramidal terminations
- Creator: Dexter Perkins
- License: CC0 1.0 — https://creativecommons.org/publicdomain/zero/1.0/
- Source record: https://commons.wikimedia.org/wiki/File:Apatite_crystal_(GeoDIL_number_-_23).jpg

This reference supports preliminary field identification. It is not a laboratory determination, appraisal, hazard assessment, proof of origin, or statement of land ownership, legal access, or collecting permission.