Mineral Factbook

Hydroxylapatite

Ca5(PO4)3OHIMA symbol: Haprenamed

Hydroxylapatite is a phosphate, arsenate, or vanadate mineral with the formula Ca5(PO4)3OH, crystallizing in the hexagonal system. It has a calculated density of 3.142 g/cm3. Its streak is white.

Photos

Hydroxylapatite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons
Hydroxylapatite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons
Hydroxylapatite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons
Hydroxylapatite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons

Crystallography

Crystal systemhexagonal crystal systemWikidata (CC0)
Space groupP 63/m
Cell (Å, °)a = 9.4212, b = 9.4212, c = 6.8927; α = 90, β = 90, γ = 120
Cell volume529.825 ų, Z = 2
Axial ratios1.0000:1:0.7316calculated from COD 9013627
Source structureCOD 9013627 (American Mineralogist, 2009) — 1 of 18 structures

Physical properties

Density (calculated)3.142 g/cm³calculated from COD 9013627
Streak
whitesingle sourceWikidata (CC0)

Chemistry (calculated)

Molecular weight502.31 g/molcalculated from the IMA formula
Composition (wt%)Ca 39.89%, P 18.5%, O 41.41%, H 0.2%

Classification

Nickel-Strunz (10th)8.BN.05Wikidata (CC0)
Nickel-Strunz (9th)8.BN.05Wikidata (CC0)
Dana (8th)41.8.1.3Wikidata (CC0)