Siderophyllite

Formula : KFe2Al3Si2O10(OH)2

Space group: 
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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
481.917 150.630 (Ref.: 90hol/pow) Holland T. J. B. and Powell R. (1990) An enlarged and updated internally consistent thermodynamic dataset with uncertainties and correlations: the system K2O-Na2O-CaO-MgO-MnO-FeO-Fe2O3-Al2O3-TiO2-SiO2-C-H2-O2. Journal of Metamorphic Geology 8(1), 89-124. -5262013 (Ref.: Internal calculation) -5628270 (Ref.: 90hol/pow) Holland T. J. B. and Powell R. (1990) An enlarged and updated internally consistent thermodynamic dataset with uncertainties and correlations: the system K2O-Na2O-CaO-MgO-MnO-FeO-Fe2O3-Al2O3-TiO2-SiO2-C-H2-O2. Journal of Metamorphic Geology 8(1), 89-124. 375.000 (Ref.: 90hol/pow) Holland T. J. B. and Powell R. (1990) An enlarged and updated internally consistent thermodynamic dataset with uncertainties and correlations: the system K2O-Na2O-CaO-MgO-MnO-FeO-Fe2O3-Al2O3-TiO2-SiO2-C-H2-O2. Journal of Metamorphic Geology 8(1), 89-124. 363.14 (Ref.: 90hol/pow) Holland T. J. B. and Powell R. (1990) An enlarged and updated internally consistent thermodynamic dataset with uncertainties and correlations: the system K2O-Na2O-CaO-MgO-MnO-FeO-Fe2O3-Al2O3-TiO2-SiO2-C-H2-O2. Journal of Metamorphic Geology 8(1), 89-124.
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.
393.17 190.84 -77.27 (Ref.: 90hol/pow) Holland T. J. B. and Powell R. (1990) An enlarged and updated internally consistent thermodynamic dataset with uncertainties and correlations: the system K2O-Na2O-CaO-MgO-MnO-FeO-Fe2O3-Al2O3-TiO2-SiO2-C-H2-O2. Journal of Metamorphic Geology 8(1), 89-124.
Reaction properties

Siderophyllite + 14H+ ⇌ 3Al+3 + 2Fe+2 + K+ + 2H4SiO4

298.15 K, 1 bar log10K: 40.57 ΔH°r:-480112 J·mol-1 (Ref.: 90hol/pow) Holland T. J. B. and Powell R. (1990) An enlarged and updated internally consistent thermodynamic dataset with uncertainties and correlations: the system K2O-Na2O-CaO-MgO-MnO-FeO-Fe2O3-Al2O3-TiO2-SiO2-C-H2-O2. Journal of Metamorphic Geology 8(1), 89-124.
T(°C) 0 25 60 100 150 200 250 300
log10K 48.16 40.57 31.66 23.42 15.15 8.33 2.36 -3.22
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-2950.085236 -0.443404 185463.385859 1053.629949 -9452028.156642