IMA mineral species

Hydroxylapatite

Ca₅(PO₄)₃(OH)

Phosphate mineral.

Yellow Green Gray White & Clear

Hydroxylapatite specimen — Hydroxylapatite-338779.jpg · Wikimedia Commons (see file page for author & license)

Properties

⛏ Mohs hardness5

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💅🪙🍶🔪💎

A steel knife scratches it, it won't scratch glass.

🔷 Hexagonal✏️ streak white

Chemical formula	Ca₅(PO₄)₃(OH)
Elements	Ca, P, O, H
Crystal system	Hexagonal
Mohs hardness	5
Density	—
Streak	white
Color	—
IMA symbol	Hap
Nickel–Strunz class	8.BN.05

“—” means no reliable value in Wikidata yet. Check Mindat for full data.

Varieties & related stones

Dahllite

Learn more

Hydroxylapatite on Mindat.org
Wikipedia article
Wikidata item Q413478 (source of this page's data – you can correct it there)