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Mineral speciesFormula
 Albite(high)NaAlSi3O8 
Mineralogy
Family: Feldspar Group 
Space group: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: C1 
Dana class: 76.1.3.1 (76) Tectosilicate Al-Si Framework (76.1) with Al-Si frameworks (76.1.3) Plagioclase series 
Geological context
High temperature: Low temperature mineral, zeolite facies, low temperature mineral, its break-down temperature around 200C in albite depends on water partial pressure and its Si and Al content. 
Geological context: The differences between high and low albite are based on the Si-Al disordering process. To summarize, the Analbite is a high (-temperature) albite completely disordered and the low abite is a low-temperature albite fully ordered. No data are available about polymorphs occurences : see Albite. 
Thermodynamics
Individual properties
Molar weight: 262.223 g/mol  ΔGºf-3,705,063 J/mol ref.  Sº: 224.40 J/mol/K ref. 
  ΔHºf-3,923,380 J/mol ref.  Cp: 204.82 J/mol/K ref. 
Reaction properties
Chemical reaction:  Albite(high) + 4H+ + 4H2O = Al+3 + Na+ + 3H4SiO4 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -6.98711449e+2   -1.10188392e-1   4.03030234e+4   2.51214118e+2   -1.87451727e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)4.14
ΔH°r-95,623 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  5.67   4.14   2.39   0.81   -0.75   -2.04   -3.21   -4.34 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:207.22 J/mol/K 
b:142.61 J/mol/K2 
c:-39.93 J.K/mol 

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