Analcime

Formula : Na0.99Al0.99Si2.01O6:H2O

Family: 
Zeolites
Space group: 
Triclinic - Pedial H-M Symbol (1) Space Group: P1
Dana class: 
77.1.1.1 (77) Tectosilicate Zeolite group (77.1) true zeolites (77.1.1) Analcime and related species
High temperature: 
Low temperature mineral.
Geological context: 
Occurs frequently in basalts and other basic igneous rocks associated with other zeolites. In the groundmass or vesicles of silica-poor intermediate and mafic igneous rocks, typically basalts and phonolites, from late-stage hydrothermal solutions, or disseminated due to deuteric alteration. In lake beds, altered from pyroclastics or clays, or as a primary precipitate; occurs also as authigenic in sandstones and siltstones.

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
219.935 96.680 (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. -3089091 (Ref.: Internal calculation) -3308000 (Ref.: 04neu/hov) Neuhoff, P.S., Hovis, G.L., Balassone, G., and Stebbins, J.F., 2004, Thermodynamic properties of analcime solid solutions. American Journal of Science, v. 304, p. 21-66. 231.100 (Ref.: 82joh/flo, 04neu/hov) 212.38 (Ref.: 82joh/flo) Johnson G. K., Flotow H. E., O'Hare P. A. G., and Wise W. S. (1982) Thermodynamic studies of zeolites : analcime and dehydrated analcime. American Mineralogist 67, 736-748.
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.
108.77 296.89 13.42 (Ref.: 82joh/flo) Johnson G. K., Flotow H. E., O'Hare P. A. G., and Wise W. S. (1982) Thermodynamic studies of zeolites : analcime and dehydrated analcime. American Mineralogist 67, 736-748.
Reaction properties

Analcime + 3.96H+ + 1.04H2O ⇌ 0.99Al+3 + 0.99Na+ + 2.01H4SiO4

298.15 K, 1 bar log10K: 6.65 ΔH°r:-98000 J·mol-1 (Ref.: 04neu/hov) Neuhoff, P.S., Hovis, G.L., Balassone, G., and Stebbins, J.F., 2004, Thermodynamic properties of analcime solid solutions. American Journal of Science, v. 304, p. 21-66.
T(°C) 0 25 60 100 150 200 250 300
log10K 8.15 6.65 4.80 3.08 1.37 -0.01 -1.23 -2.39
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1340.335801 -0.181350 83684.586470 475.275564 -4947688.587192