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Mineral speciesFormula
 AntarcticiteCaCl2:6H2O 
Mineralogy
Family: Halogenides, Hydrohalite - Antarcticite series 
Space group: Trigonal - Trapezohedral HM symbol (3 2) Space Group: P 321 
Dana class: 9.2.6.1IV- 9 Halide Minerals ; 9.2 Anhydrous and Hydrated Halides where A(?)2 ; 9.2.4 
Geological context
High temperature: very arid climate 
Geological context: A precipitate from highly saline brines under very arid conditions 
Thermodynamics
Individual properties
Molar weight: 219.074 g/mol  ΔGºf-2,215,590 J/mol ref.  Sº: 354.33 J/mol/K ref. 
  ΔHºf-2,606,130 J/mol ref.   
Reaction properties
Chemical reaction:  Antarcticite = Ca+2 + 2Cl- + 6H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -1.62957566e+3   -2.38386958e-1   8.69008403e+4   5.92795099e+2   -4.77375134e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)3.95
ΔH°r13,990 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  3.76   3.95   4.27   4.69   5.23   5.70   6.00   5.97 

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