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Mineral speciesFormula
 Albite(low)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: Stable below 700C with an ordered Si-Al arrangement 
Geological context: A major constituent of granites and granite pegmatites, alkalic diorites, basalts, and in hydrothermal and alpine veins. A product of potassium metasomatism and in low-temperature and low-pressure metamorphic facies and in some schists. Detrital and authigenic in sedimentary rocks. 
Thermodynamics
Individual properties
Molar weight: 262.223 g/mol  ΔGºf-3,713,043 J/mol ref.  Sº: 208.20 J/mol/K ref. 
  ΔHºf-3,936,190 J/mol ref.  Cp: 260.44 J/mol/K ref. 
Reaction properties
Chemical reaction:  Albite(low) + 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
 -6.89968472e+2   -1.14253409e-1   3.89427811e+4   2.49386272e+2   -1.86063765e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)2.74
ΔH°r-82,813 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  4.06   2.74   1.21   -0.21   -1.66   -2.93   -4.11   -5.30 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:223.20 J/mol/K 
b:296.66 J/mol/K2 
c:-45.52 J.K/mol 

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