Saponite(SapCa)

Formula : (Na0.394K0.021Ca0.038)(Si3.569Al0.397)(Mg2.949Fe0.055)O10(OH)2

Space group: 
Monoclinic - Prismatic HM symbol (2/m) Space Group: C 2/m
Dana class: 
71.3.1b.2VIII- 71 Phyllosilicate Minerals ; 71.3 Phyllosilicates Phyllosilicate Sheets of Six-Membered Rings with 2:1 clays ; 71.3.1b Smectite group (Trioctahedral Smectites)

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
391.107 141.660 (Ref.: 13gai/bla) Gailhanou, H., Blanc, P., Rogez, J., Mikaelian, G., Horiuchi, K., Yamamura, Y., Saito, K., Kawaji, H., Warmont, F., Greneche, J.-M., Vieillard, P., Fialips, C.I., Giffaut, E., Gaucher, E.C., 2013. Thermodynamic properties of saponite, nontronite, and vermiculite derived from calorimetric measurements. American Mineralogist 98, 1834-1847. -5622444 (Ref.: Internal calculation) -5994060 (Ref.: 13gai/bla) Gailhanou, H., Blanc, P., Rogez, J., Mikaelian, G., Horiuchi, K., Yamamura, Y., Saito, K., Kawaji, H., Warmont, F., Greneche, J.-M., Vieillard, P., Fialips, C.I., Giffaut, E., Gaucher, E.C., 2013. Thermodynamic properties of saponite, nontronite, and vermiculite derived from calorimetric measurements. American Mineralogist 98, 1834-1847. 314.550 (Ref.: 13gai/bla) Gailhanou, H., Blanc, P., Rogez, J., Mikaelian, G., Horiuchi, K., Yamamura, Y., Saito, K., Kawaji, H., Warmont, F., Greneche, J.-M., Vieillard, P., Fialips, C.I., Giffaut, E., Gaucher, E.C., 2013. Thermodynamic properties of saponite, nontronite, and vermiculite derived from calorimetric measurements. American Mineralogist 98, 1834-1847. 347.29 (Ref.: 09gai) Gailhanou H. (2009) : Thermochimie : Acquisition des proprietes thermodynamiques d'une nontronite, d'une beidellite et revision des donnees de la saponite Sap-Ca-1. Rapport final BRGM/RP-57797-FR
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.
359.93 251.10 -77.79 (Ref.: 09gai) Gailhanou H. (2009) : Thermochimie : Acquisition des proprietes thermodynamiques d'une nontronite, d'une beidellite et revision des donnees de la saponite Sap-Ca-1. Rapport final BRGM/RP-57797-FR
Reaction properties

Saponite(SapCa) + 7.724H+ + 2.276H2O ⇌ 0.397Al+3 + 0.038Ca+2 + 0.034Fe+3

298.15 K, 1 bar log10K: 31.47 ΔH°r:-277172 J·mol-1 (Ref.: 13gai/bla) Gailhanou, H., Blanc, P., Rogez, J., Mikaelian, G., Horiuchi, K., Yamamura, Y., Saito, K., Kawaji, H., Warmont, F., Greneche, J.-M., Vieillard, P., Fialips, C.I., Giffaut, E., Gaucher, E.C., 2013. Thermodynamic properties of saponite, nontronite, and vermiculite derived from calorimetric measurements. American Mineralogist 98, 1834-1847.
T(°C) 0 25 60 100 150 200 250 300
log10K 35.79 31.47 26.31 21.56 16.91 13.19 10.03 7.10
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-2579.023128 -0.350896 164292.254929 916.840396 -9296938.592998