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Mineral speciesFormula
 GlauberiteNa2Ca(SO4)2 
Mineralogy
Family: Miscellaneous salts 
Space group: Monoclinic - Prismatic HM symbol (2/m) Space Group: C 2/c 
Dana class: 28.4.2.1VI- 28 Sulfate Minerals ; 28.4 Anhydrous Acid and Sulfates with miscellaneous formulae ; 28.4.1 
Geological context
Geological context: A common constituent of continental and marine evaporite deposits; as sublimates around fumaroles; in mineral-filled cavities in basaltic lava; in nitrate deposits in arid climates. 
Thermodynamics
Individual properties
Molar weight: 278.185 g/mol  ΔGºf-2,553,476 J/mol ref.  Sº: 104.12 J/mol/K ref. 
  ΔHºf-2,829,200 J/mol ref.   
Reaction properties
Chemical reaction:  Glauberite = Ca+2 + 2Na+ + 2SO4-2 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -3.30213120e+3   -5.10533226e-1   1.83123563e+5   1.19783395e+3   -1.08312003e+7 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)1.97
ΔH°r-13,160 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  2.07   1.97   1.61   1.05   0.21   -0.84   -2.23   -4.26 

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