Crandallite

Formula : CaAl3(PO4)2(OH)5:H2O

Family: 
Phosphates
Space group: 
Trigonal - Hexagonal Scalenohedral HM symbol (-3 2/m) Space Group: R 3m
Dana class: 
42.7.3.1Hex ; 42.7 Hydrated Phosphates, etc., Containing Hydroxyl or Halogen where (AB)5 (XO4)3 Zq . x(H2O) ; 42.7.3

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
 V°
cm3·mol-1
 ΔGºf
J·mol-1
 ΔHºf
J·mol-1
 Sº
J·mol-1·k-1
 CP
J·mol-1·K-1
414.017 138.000 (Ref.: 63wyc) Wyckoff, R.W.G., 1963, Crystal Structures, Second edition, tome 4, Interscience Publishers, New York, p. 320-322. -5592750 (Ref.: 79vie/tar) Vieillard P., Tardy Y., Nahon D., 1979, Stability field of clays and aluminum phosphates: Parageneses in lateritic weathering of argillaceous phosphatic sediments. Am. Miner., 64, 626-634
CP(T) = a + b·T + ·c·T-2 (T in Kelvin)
a
J·mol-1·K-1
 b * 103
J·mol-1·K-2
 c * 10-5
J·K·mol-1
 Maier Kelley Ref.
Reaction properties

Crandallite + 9H+ ⇌ 3Al+3 + Ca+2 + 2H2PO4- + 6H2O

298.15 K, 1 bar log10K: 21.05 ΔH°r: J·mol-1 (Ref.: )
T(°C) 0 25 60 100 150 200 250 300
log10K 21.05 21.05 21.05 21.05 21.05 21.05 21.05 21.05
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
21.050586 0.000000 0.000000 0.000000 0.000000