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Mineral speciesFormula
 GibbsiteAl(OH)3 
Mineralogy
Family: Gibbsite - Doyleite series 
Space group: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/n 
Dana class: 6.3.1.1 (6)Hydroxides and Oxides Containing Hydroxyl (6.3) with (OH)3 or (OH)6 groups (6.3.1) Dana Group  
Geological context
High temperature: Stable at room temperature. 
Geological context: Mineral common in lateritic soils developed on aluminous rocks in areas of high rainfall, but also common in aluminum-bearing byproducts from thermic processes. 
Thermodynamics
Individual properties
Molar weight: 78.004 g/mol  ΔGºf-1,154,909 J/mol ref.  Sº: 68.45 J/mol/K ref. 
  ΔHºf-1,293,131 J/mol ref.  Cp: 91.72 J/mol/K ref. 
Reaction properties
Chemical reaction:  Gibbsite + 3H+ = Al+3 + 3H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -4.93752625e+2   -8.09001544e-2   2.97138788e+4   1.77903516e+2   -1.26765911e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)7.74
ΔH°r-102,759 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  9.39   7.74   5.85   4.13   2.42   1.00   -0.25   -1.43 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:54.70 J/mol/K 
b:170.27 J/mol/K2 
c:-12.22 J.K/mol 

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