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Mineral speciesFormula
 Cordierite(hydrated)Mg2Al3(AlSi5)O18:H2O 
Mineralogy
Family: Cyclosilicates, Cordierite Group 
Space group: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C ccm 
Dana class: 61.2.1.1 (61) Cyclosilicate Six-Membered Rings (61.2) with Al substituted rings (61.2.1)Cordierite group 
Geological context
High temperature: Stability of hydrous cordierite is related to aH2O and aCO2 in the magma during anatexis or high grade metamorphism : high temperature mineral 
Geological context: Rather magmatic mineral. 
Thermodynamics
Individual properties
Molar weight: 602.968 g/mol  ΔGºf-8,875,440 J/mol ref.  Sº: 466.22 J/mol/K ref. 
  ΔHºf-9,437,748 J/mol ref.  Cp: 499.99 J/mol/K ref. 
Reaction properties
Chemical reaction:  Cordierite(hydrated) + 16H+ + H2O = 4Al+3 + 2Mg+2 + 5H4SiO4 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -2.76575453e+3   -4.45413031e-1   1.74184090e+5   9.90421545e+2   -7.53276734e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)51.66
ΔH°r-669,993 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  62.37   51.66   39.31   28.00   16.67   7.36   -0.74   -8.22 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:649.48 J/mol/K 
b:107.95 J/mol/K2 
c:-161.50 J.K/mol 

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