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Mineral speciesFormula
 GaylussiteCaNa2(CO3)2:5H2O 
Mineralogy
Family: Miscellaneous salts 
Space group: Monoclinic - Prismatic HM symbol (2/m) Space Group: I2/a 
Dana class: 15.2.2.1V - 15 Hydrated Carbonates ; 15.2 Hydrated Carbonates where A+m B++n (XO3)p . x(H2O), (m+n):p > 1:1 ; 15.2.1 
Geological context
Geological context: Typically in evaporites or shales from alkali lakes; rarely in veinlets cutting alkalic igneous rocks. 
Thermodynamics
Individual properties
Molar weight: 296.152 g/mol  ΔGºf-3,372,037 J/mol ref.  Sº: 386.68 J/mol/K ref. 
  ΔHºf-3,834,386 J/mol ref.   
Reaction properties
Chemical reaction:  Gaylussite + 2H+ = 2HCO3- + Ca+2 + 2Na+ + 5H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -1.84670315e+3   -2.59903876e-1   9.94616589e+4   6.71519489e+2   -5.31624140e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)11.23
ΔH°r1,696 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  11.27   11.23   11.38   11.77   12.42   13.10   13.67   13.92 

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