Home > Data consultation > Mineral species
 
Mineral speciesFormula
 Clinoptilolite(K)K1.1(Si4.9Al1.1)O12:2.7H2O 
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: 450.941 g/mol  ΔGºf-6,107,026 J/mol ref.  Sº: 507.66 J/mol/K ref. 
  ΔHºf-6,568,410 J/mol ref.  Cp: 454.31 J/mol/K ref. 
Reaction properties
Chemical reaction:  Clinoptilolite(K) + 4.4H+ + 4.9H2O = 1.1Al+3 + 1.1K+ + 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
 -7.15620551e+2   -1.07508991e-1   3.99958575e+4   2.56414818e+2   -1.96655931e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-1.17
ΔH°r-60,469 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  -0.19   -1.17   -2.26   -3.20   -4.10   -4.83   -5.50   -6.18 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:454.31 J/mol/K 
b:0.00 J/mol/K2 
c:0.00 J.K/mol 

Home | Legal information | Private area | Contact us | RSS 2.0 BRGM − 3, avenue Claude Guillemin − 45060 Orléans Cedex 2