Scolecite

Formula : CaAl2Si3O10:3H2O

Family: 
Zeolites
Space group: 
Monoclinic - Domatic HM symbol (m) Space Group: Cc
Dana class: 
77.1.5.5VIII- 77 Tektosilicates Tectosilicate Zeolite group ; 77.1 Tektosilicates Tectosilicate Zeolite group true zeolites ; 77.1.5 Natrolite 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
392.337 172.300 (Ref.: 95rob/hem) Robie R.A., and Hemingway B.S., 1995. Thermodynamic properties of minerals and related substances at 298.15 K and 1 Bar (105 Pascals) pressure and at higher temperatures. U.S. Geol. Survey Bull., 2131, 461 pp. -5597980 (Ref.: Internal calculation) -6049000 (Ref.: 83joh/flo) Johnson G. K., Flotow H. E., and O'Hare P. A. G. (1983) Thermodynamic studies of zeolites:natrolite mesolite and scolecite. American Mineralogist 68, 1137-1145 367.420 (Ref.: 83joh/flo) Johnson G. K., Flotow H. E., and O'Hare P. A. G. (1983) Thermodynamic studies of zeolites:natrolite mesolite and scolecite. American Mineralogist 68, 1137-1145 382.81 (Ref.: 83joh/flo) Johnson G. K., Flotow H. E., and O'Hare P. A. G. (1983) Thermodynamic studies of zeolites:natrolite mesolite and scolecite. American Mineralogist 68, 1137-1145
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.
135.19 830.53 0.00 (Ref.: 83joh/flo) Johnson G. K., Flotow H. E., and O'Hare P. A. G. (1983) Thermodynamic studies of zeolites:natrolite mesolite and scolecite. American Mineralogist 68, 1137-1145
Reaction properties

Scolecite + 8H+ ⇌ 2Al+3 + Ca+2 + 3H4SiO4 + H2O

298.15 K, 1 bar log10K: 16.65 ΔH°r:-233213 J·mol-1 (Ref.: 83joh/flo) Johnson G. K., Flotow H. E., and O'Hare P. A. G. (1983) Thermodynamic studies of zeolites:natrolite mesolite and scolecite. American Mineralogist 68, 1137-1145
T(°C) 0 25 60 100 150 200 250 300
log10K 20.26 16.65 12.27 8.20 4.09 0.68 -2.37 -5.29
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-2369.273844 -0.340262 146230.069608 844.313116 -8203595.638127