Gibbsite(mc)

Formula : Al(OH)3

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
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.

Dernière mise à jour le 11.06.2018

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
cm3·mol-1
ΔGºf
J·mol-1
ΔHºf
J·mol-1
J·mol-1·k-1
CP
J·mol-1·K-1
78.004 31.956 -1145691 -1293380 36.697
Reaction properties

Gibbsite(mc) + 3H+ ⇌ Al+3 + 3H2O

298.15 K, 1 bar log10K: 9.35 ΔH°r: -102510 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 11.02 9.35 7.50 5.88 4.33 3.13 2.12 1.21