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Mineral speciesFormula
 BurkeiteNa6CO3(SO4)2 
Mineralogy
Family: Miscellaneous salts 
Space group: Orthorhombic - Dipyramidal HM symbol (2/m 2/m 2/m) Space Group: P mmm 
Dana class: 32.1.1.1VI- 32 Compound Sulfates ; 32.1 Compound Sulfates (anhydrous) with simple bi-anionic formula ; 31.10.6 
Geological context
Geological context: An uncommon product of evaporation in dry lakes, but typical of efflorescences on saline soils 
Thermodynamics
Individual properties
Molar weight: 390.075 g/mol  ΔGºf-3,650,967 J/mol ref.   
   
Reaction properties
Chemical reaction:  Burkeite + H+ = HCO3- + 6Na+ + 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
 -7.70000000e-1   0.00000000e+0   0.00000000e+0   0.00000000e+0   0.00000000e+0 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-0.77
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  -0.77   -0.77   -0.77   -0.77   -0.77   -0.77   -0.77   -0.77 

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