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Mineral speciesFormula
 Berthierine(FeIII)(Fe2.67Al0.33)(Si1.34Al0.66)O5(OH)4 
Mineralogy
Family: Kaolinite-Serpentine Group 
Space group: Monoclinic - Domatic HM symbol (m) Space Group: Cm 
Dana class: 71.1.2c.2VIII- 71 Phyllosilicate Minerals ; 71.1 Phyllosilicates Phyllosilicate Sheets of Six-Membered Rings with 1:1 layers ; 71.1.2c Serpentine group (Amesite subgroup) 
Geological context
Geological context: Common unmetamorphosed marine sediments and in lateritic soils 
Thermodynamics
Individual properties
Molar weight: 361.484 g/mol  ΔGºf-3,150,424 J/mol ref.  Sº: 285.00 J/mol/K ref. 
  ΔHºf-3,456,240 J/mol ref.  Cp: 292.78 J/mol/K ref. 
Reaction properties
Chemical reaction:  Berthierine(FeIII) + 8.64H+ = 0.99Al+3 + 2.34Fe+2 + 1.34H4SiO4 + 0.33Fe+3 + 3.64H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -1.48287604e+3   -2.28160294e-1   9.23086038e+4   5.32371945e+2   -4.15514027e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)29.28
ΔH°r-269,337 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  34.12   29.28   23.74   18.73   13.79   9.80   6.36   3.18 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:292.78 J/mol/K 
b:0.00 J/mol/K2 
c:0.00 J.K/mol 

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