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Mineral speciesFormula
 ArtiniteMg2(OH)2(CO3):3H2O 
Mineralogy
Family: Hydromagnesite - Brugnatellite series 
Space group: Monoclinic Space Group: C 2 or C 2/m 
Dana class: 16b.3.1.1 (16b) Carbonates - Hydroxyl or Halogen (16b.3) where Am Bn (XO3)p Zq . x(H2O), (m+n):p = 2:1(16b.3.1)Dana Group 
Geological context
High temperature: Low temperature mineral also possible in weathered environments. 
Geological context: It is always associated with ultra-basic igneous and metamorphic rocks such as serpentinite. 
Thermodynamics
Individual properties
Molar weight: 196.679 g/mol  ΔGºf-2,568,352 J/mol ref.  Sº: 232.92 J/mol/K ref. 
  ΔHºf-2,920,612 J/mol ref.  Cp: 296.05 J/mol/K ref. 
Reaction properties
Chemical reaction:  Artinite + 3H+ = HCO3- + 2Mg+2 + 5H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -1.29206897e+3   -1.98653598e-1   7.55639559e+4   4.69127004e+2   -3.80702752e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)20.14
ΔH°r-132,468 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  22.26   20.14   17.71   15.52   13.34   11.55   9.94   8.30 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:296.52 J/mol/K 
b:115.73 J/mol/K2 
c:-31.09 J.K/mol 

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