Heulandite(Ca)

Formula : Ca1.07Al2.14Si6.86O18:6.17H2O

Family: 
Zeolites
Space group: 
Monoclinic Space Group: C 2/m, Cm, C 2
Dana class: 
77.1.4.1 (77) Tectosilicate Zeolite group(77.1) true zeolites (77.1.4) Heulandite and related species
High temperature: 
See Laumontite
Geological context: 
Alteration product of plagioclase in lavas

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
692.434 315.650 (Ref.: 97coo/alb) Coombs, D.S., Alberti, A., Armbruster, T., Artioli, G., Colella, C., Galli, E., Grice, J.D., Liebau, F., Mandarino, J.A., Minato, H., Nickel, E.H., Passaglia, E., Peacor, D.R., Quartieri, S., Rinaldi, R., Ross, M., Sheppard, R.A., Tillmanns, E., Vealini, G., 1997. Recommended nomenclature for zeolite minerals - report of the subcommittee on zeolites of the international mineralogical association, commission on new minerals and mineral names. Canadian Mineralogist, 35, 1571-1606. -9827065 (Ref.: 09bla) Blanc P. (2009) - Thermochimie - Selection de constantes thermodynamiques pour les zeolites : version 2. Rapport final. Rapport BRGM/RP-57796-FR. 55 p. -10667200 (Ref.: 09bla) Blanc P. (2009) - Thermochimie - Selection de constantes thermodynamiques pour les zeolites : version 2. Rapport final. Rapport BRGM/RP-57796-FR. 55 p. 701.829 (Ref.: Internal calculation) 719.05 (Ref.: 10vie) Vieillard P., 2010 - A predictive model for the entropies and heat capacities of zeolites. Eur. J. Mineral. 22, 823-836
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.
506.71 962.00 -66.21 (Ref.: 10vie) Vieillard P., 2010 - A predictive model for the entropies and heat capacities of zeolites. Eur. J. Mineral. 22, 823-836
Reaction properties

Heulandite(Ca) + 8.56H+ + 3.27H2O ⇌ 2.14Al+3 + 1.07Ca+2 + 6.86H4SiO4

298.15 K, 1 bar log10K: 2.46 ΔH°r:-139108 J·mol-1 (Ref.: 09bla) Blanc P. (2009) - Thermochimie - Selection de constantes thermodynamiques pour les zeolites : version 2. Rapport final. Rapport BRGM/RP-57796-FR. 55 p.
T(°C) 0 25 60 100 150 200 250 300
log10K 4.43 2.46 -0.27 -2.90 -5.56 -7.79 -9.86 -12.00
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-3760.770088 -0.504838 230838.241644 1333.764343 -14294417.600799