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Mineral speciesFormula
 Gibbsite(am)Al(OH)3 
Mineralogy
Family: Gibbsite - Doyleite series 
Space group: Monoclinic - Prismatic HM symbol (2/m) Space Group: P 21/n 
Dana class: 6.3.1.1VI - 6 Hydroxides and Oxides Containing Hydroxyl ; 6.3 Hydroxides and Oxides Containing Hydroxyl with (OH)3 or (OH)6 groups ; 6.2.2 
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-1,138,697 J/mol ref.  Sº: 71.13 J/mol/K ref. 
  ΔHºf-1,276,120 J/mol ref.   
Reaction properties
Chemical reaction:  Gibbsite(am) + 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
 -5.16038575e+2   -7.64531963e-2   3.20635995e+4   1.84482098e+2   -1.29956671e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)10.58
ΔH°r-119,770 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  12.52   10.58   8.41   6.49   4.67   3.24   2.05   0.98 

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