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Mineral speciesFormula
 Clinoptilolite(Ca)Ca0.55(Si4.9Al1.1)O12:3.9H2O 
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: 451.594 g/mol  ΔGºf-6,390,269 J/mol ref.  Sº: 498.89 J/mol/K ref. 
  ΔHºf-6,923,330 J/mol ref.  Cp: 481.02 J/mol/K ref. 
Reaction properties
Chemical reaction:  Clinoptilolite(Ca) + 4.4H+ + 3.7H2O = 1.1Al+3 + 0.55Ca+2 + 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
 -7.47854088e+2   -1.13362578e-1   4.12435742e+4   2.67931213e+2   -1.93510283e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-2.11
ΔH°r-69,841 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  -0.97   -2.11   -3.36   -4.44   -5.45   -6.25   -6.98   -7.73 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:481.02 J/mol/K 
b:0.00 J/mol/K2 
c:0.00 J.K/mol 

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