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Mineral speciesFormula
 Clinoptilolite(Na)Na1.1(Si4.9Al1.1)O12:3.5H2O 
Mineralogy
Family: Zeolite Group 
Space group: Monoclinic - Prismatic HM symbol (2/m) Space Group: C 2/m 
Dana class: 77.1.4.2bVIII- 77 Tektosilicates Tectosilicate Zeolite group ; 77.1 Tektosilicates Tectosilicate Zeolite group true zeolites ; 77.1.4 Heulandite and related species 
Geological context
Geological context: Formed by devitri_cation of volcanic glass, and in cavities in rhyolites and andesites. 
Thermodynamics
Individual properties
Molar weight: 447.634 g/mol  ΔGºf-6,268,255 J/mol ref.  Sº: 502.72 J/mol/K ref. 
  ΔHºf-6,782,360 J/mol ref.  Cp: 470.38 J/mol/K ref. 
Reaction properties
Chemical reaction:  Clinoptilolite(Na) + 4.4H+ + 4.1H2O = 1.1Al+3 + 1.1Na+ + 4.9H4SiO4 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -7.86986676e+2   -1.13642323e-1   4.38439232e+4   2.81877155e+2   -2.11654512e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-0.14
ΔH°r-62,203 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  0.88   -0.14   -1.24   -2.14   -2.93   -3.53   -4.04   -4.57 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:470.38 J/mol/K 
b:0.00 J/mol/K2 
c:0.00 J.K/mol 

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