Hydroxyapatite(Natur)

Formula : Ca5(PO4)3(OH)

Family: 
Space group: 
Monoclinic - Domatic HM symbol (m) Space Group: P 63/m 6/
Dana class: 
41.8.1.0VII - 41 Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen ; 41.8 Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen where(?)5 (XO4)3 Zq ; 41.8.1
High temperature: 
It is stable in a wide range of temperature. Its stability at room temperature is possible.
Geological context: 
Apatite is the most abundant naturally occuring phosphate on Earth. Occurs in metamorphic rocks, sedimentary environments or precipitate from hydrothermal solutions

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Reaction properties

Hydroxyapatite(Natur) + 7H+ ⇌ 5Ca+2 + 3H2PO4- + H2O

298.15 K, 1 bar log10K: 14.34 ΔH°r:-178396 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 17.08 14.34 10.90 7.42 3.49 -0.22 -3.98 -8.18