Stellerite

Formula : Ca2Al4Si14O36:14H2O

Family: 
Zeolites
Space group: 
Orthorhombic - Dipyramidal HM symbol (2/m 2/m 2/m) Space Group: F mmm
Dana class: 
77.1.4.4VIII- 77 Tektosilicates Tectosilicate Zeolite group ; 77.1 Tektosilicates Tectosilicate Zeolite group true zeolites ; 77.1.4 Heulandite and related species

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
1409.470 666.500 (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. -19923000 (Ref.: Internal calculation) -21656238 (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. 1604.730 (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. 1573.96 (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.
1787.49 632.96 -357.57 (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

Stellerite + 16H+ + 6H2O ⇌ 4Al+3 + 2Ca+2 + 14H4SiO4

298.15 K, 1 bar log10K: 6.99 ΔH°r:-292435 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 11.15 6.99 1.26 -4.26 -9.83 -14.43 -18.60 -22.82
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-7218.114068 -0.956028 448088.371805 2554.661309 -27921038.813602