Arsenocrandallite

Formula : CaAl3(AsO4)2(OH)5:H2O

Family: 
Arsenate
Space group: 
Trigonal - Ditrigonal pyramidal l HM Symbol (3m) Space group: R 3m
High temperature: 
low temperature
Geological context: 
secondary mineral from mine dumps

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
501.913 -4887010 (Ref.: 93sch/got) Schwab R. G., Gotz C., Herold H., and Oliveira N. P. (1993) Compounds of the crandallite type-Thermodynamic properties of Caphosphates, Sr-phosphates, Ba-phosphates, Pb-phosphates, La-phosphates, Ce-phosphates to Gd-phosphates and Ca-arsenates, Ba-arsenates, Pb-arsenates, La-arsenates, Ce-arsenate.Srarsenates, Neues Jahrb Miner Monatsh. 12, 551-568.
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

Arsenocrandallite + 9H+ ⇌ 3Al+3 + 2H2AsO4- + Ca+2 + 6H2O

298.15 K, 1 bar log10K: 10.15 ΔH°r: J·mol-1 (Ref.: )
T(°C) 0 25 60 100 150 200 250 300
log10K 10.15 10.15 10.15 10.15 10.15 10.15 10.15 10.15
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
10.146479 0.000000 0.000000 0.000000 0.000000