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Mineral speciesFormula
 FluoriteCaF2 
Mineralogy
Family: Halogenides, Fluorite series 
Space group: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m 
Dana class: 9.2.1.1 (9) Anhydrous and Hydrated Halides (9.2) where A (X)2 (9.2.1) Dana Group 
Geological context
High temperature: Fluorite is stable at low temperature but not at room temperature. 
Geological context: Occurs widespread as common mineral in hydrothermal ore deposits; in cavities in sedimentary rocks; as hot spring deposit; in certain granites. 
Thermodynamics
Individual properties
Molar weight: 78.075 g/mol  ΔGºf-1,175,844 J/mol ref.  Sº: 68.58 J/mol/K ref. 
  ΔHºf-1,228,260 J/mol ref.  Cp: 71.12 J/mol/K ref. 
Reaction properties
Chemical reaction:  Fluorite = Ca+2 + 2F- 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -1.64968806e+3   -2.66115399e-1   8.87530955e+4   5.98369981e+2   -5.31462504e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-10.51
ΔH°r14,560 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  -10.81   -10.51   -10.33   -10.35   -10.62   -11.12   -11.90   -13.07 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:59.83 J/mol/K 
b:30.46 J/mol/K2 
c:1.97 J.K/mol 

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