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Mineral speciesFormula
 AragoniteCaCO3 
Mineralogy
Family: Aragonite Group 
Space group: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmcn 
Dana class: 14.1.3.1 (14) Anhydrous Carbonates (14.1) with Simple Formula A+ CO3 (14.1.3) Aragonite Group (Orthorhombic: Pmcn) 
Geological context
High temperature: Very low temperature mineral <50C in hydrothermal systems 
Geological context: Widespread mineral in hydrothemal systems and also as a biological secretion. 
Thermodynamics
Individual properties
Molar weight: 100.087 g/mol  ΔGºf-1,128,154 J/mol ref.  Sº: 87.99 J/mol/K ref. 
  ΔHºf-1,207,780 J/mol ref.  Cp: 82.32 J/mol/K ref. 
Reaction properties
Chemical reaction:  Aragonite + H+ = HCO3- + Ca+2 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -8.59031226e+2   -1.39091087e-1   4.76863551e+4   3.12469450e+2   -2.72107745e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)2.01
ΔH°r-25,150 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  2.39   2.01   1.51   0.97   0.31   -0.36   -1.08   -1.96 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:82.32 J/mol/K 
b:0.00 J/mol/K2 
c:0.00 J.K/mol 

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