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Mineral speciesFormula
 HaliteNaCl 
Mineralogy
Family: Halite Group 
Space group: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m 
Dana class: 9.1.1.1 (9) Anhydrous and Hydrated Halides (9.1) where A X(9.1.1) Dana Group 
Geological context
High temperature: Temperatures stability range from room temperature to ... 
Geological context: A widespread salt, occurs comonly in sedimentary rocks, hydrothermal systems and magmatic rocks in fluid inclusions. 
Thermodynamics
Individual properties
Molar weight: 58.442 g/mol  ΔGºf-384,072 J/mol ref.  Sº: 72.12 J/mol/K ref. 
  ΔHºf-411,120 J/mol ref.  Cp: 50.81 J/mol/K ref. 
Reaction properties
Chemical reaction:  Halite = Cl- + Na+ 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -7.52249543e+2   -1.19049577e-1   4.13857035e+4   2.74179327e+2   -2.48091090e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)1.59
ΔH°r3,700 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  1.50   1.59   1.63   1.59   1.45   1.24   0.92   0.43 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:45.94 J/mol/K 
b:16.32 J/mol/K2 
c:0.00 J.K/mol 

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