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Mineral speciesFormula
 AnalcimeNa0.99Al0.99Si2.01O6:H2O 
Mineralogy
Family: Zeolite, Analcime - Paulingite series 
Space group: Triclinic - Pedial H-M Symbol (1) Space Group: P1 
Dana class: 77.1.1.1 (77) Tectosilicate Zeolite group (77.1) true zeolites (77.1.1) Analcime and related species 
Geological context
High temperature: Low temperature mineral. 
Geological context: Occurs frequently in basalts and other basic igneous rocks associated with other zeolites. In the groundmass or vesicles of silica-poor intermediate and mafic igneous rocks, typically basalts and phonolites, from late-stage hydrothermal solutions, or disseminated due to deuteric alteration. In lake beds, altered from pyroclastics or clays, or as a primary precipitate; occurs also as authigenic in sandstones and siltstones. 
Thermodynamics
Individual properties
Molar weight: 219.935 g/mol  ΔGºf-3,089,091 J/mol ref.  Sº: 231.10 J/mol/K ref. 
  ΔHºf-3,308,000 J/mol ref.  Cp: 212.38 J/mol/K ref. 
Reaction properties
Chemical reaction:  Analcime + 3.96H+ + 1.04H2O = 0.99Al+3 + 0.99Na+ + 2.01H4SiO4 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -7.01771430e+2   -1.08541413e-1   4.11847559e+4   2.52228396e+2   -1.90952403e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)6.64
ΔH°r-102,690 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  8.29   6.64   4.77   3.09   1.44   0.10   -1.09   -2.22 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:108.77 J/mol/K 
b:296.89 J/mol/K2 
c:13.42 J.K/mol 

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