Stilbite

Formula : NaCa2(Al5Si13)O36:16H2O

Family: 
Zeolites
Space group: 
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Dana class: 
77.1.4.3 (77) Tectosilicate Zeolite group (77.1) true zeolites (77.1.4) Heulandite and related species
High temperature: 
See Laumontite
Geological context: 
See Laumontite

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
1467.390 664.700 (Ref.: 01fri/neu) Fridriksson, T., Neuhoff, P. S., Arnorsson, S., and Bird, D. K., 2001, Geological constraints on the thermodynamic properties of the stilbite-stellerite solid solution in low-grade metabasalts. Geochimica Cosochimica Acta, v. 65, p. 3993-4008. -20694570 (Ref.: Internal calculation) -22579709 (Ref.: 01fri/neu) Fridriksson, T., Neuhoff, P. S., Arnorsson, S., and Bird, D. K., 2001, Geological constraints on the thermodynamic properties of the stilbite-stellerite solid solution in low-grade metabasalts. Geochimica Cosochimica Acta, v. 65, p. 3993-4008. 1622.560 (Ref.: 01fri/neu) Fridriksson, T., Neuhoff, P. S., Arnorsson, S., and Bird, D. K., 2001, Geological constraints on the thermodynamic properties of the stilbite-stellerite solid solution in low-grade metabasalts. Geochimica Cosochimica Acta, v. 65, p. 3993-4008. 1697.03 (Ref.: 01fri/neu) Fridriksson, T., Neuhoff, P. S., Arnorsson, S., and Bird, D. K., 2001, Geological constraints on the thermodynamic properties of the stilbite-stellerite solid solution in low-grade metabasalts. Geochimica Cosochimica Acta, v. 65, p. 3993-4008.
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.
1961.21 601.66 -394.30 (Ref.: 01fri/neu) Fridriksson, T., Neuhoff, P. S., Arnorsson, S., and Bird, D. K., 2001, Geological constraints on the thermodynamic properties of the stilbite-stellerite solid solution in low-grade metabasalts. Geochimica Cosochimica Acta, v. 65, p. 3993-4008.
Reaction properties

Stilbite + 20H+ ⇌ 5Al+3 + 2Ca+2 + Na+ + 13H4SiO4

298.15 K, 1 bar log10K: 23.04 ΔH°r:-403823 J·mol-1 (Ref.: 01fri/neu) Fridriksson, T., Neuhoff, P. S., Arnorsson, S., and Bird, D. K., 2001, Geological constraints on the thermodynamic properties of the stilbite-stellerite solid solution in low-grade metabasalts. Geochimica Cosochimica Acta, v. 65, p. 3993-4008.
T(°C) 0 25 60 100 150 200 250 300
log10K 29.04 23.04 15.31 8.02 0.73 -5.28 -10.67 -16.03
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-7470.079232 -1.009972 461705.278054 2651.081200 -27934606.070523