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Mineral speciesFormula
 Chlorapatite(Synth)Ca5(PO4)3Cl 
Mineralogy
Family: Apatite - Pyromorphite Group 
Space group: Monoclinic - Domatic HM symbol (m) Space Group: P 63/m 6/ 
Dana class: 41.8.1.0VII - 41 Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen ; 41.8 Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen where(?)5 (XO4)3 Zq ; 41.8.1 
Geological context
High temperature: It is stable in a wide range of temperature. Its stability at room temperature is possible. 
Geological context: Apatite is the most abundant naturally occuring phosphate on Earth. Occurs in metamorphic rocks, sedimentary environments or precipitate from hydrothermal solutions 
Thermodynamics
Individual properties
Molar weight: 520.756 g/mol  ΔGºf-6,276,968 J/mol ref.  Sº: 397.90 J/mol/K ref. 
  ΔHºf-6,657,339 J/mol ref.  Cp: 398.97 J/mol/K ref. 
Reaction properties
Chemical reaction:  Chlorapatite(Synth) + 6H+ = 5Ca+2 + Cl- + 3H2PO4- 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -3.73412476e+3   -6.12400374e-1   2.07924360e+5   1.35709824e+3   -1.18682424e+7 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)5.21
ΔH°r-132,541 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  7.17   5.21   2.55   -0.32   -3.76   -7.21   -10.90   -15.23 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:398.97 J/mol/K 
b:0.00 J/mol/K2 
c:0.00 J.K/mol 

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