Gibbsite

Formula : Al(OH)3

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
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 -1154909 -1293131 68.450 91.72
Reaction properties

Gibbsite + 3H+ ⇌ Al+3 + 3H2O

298.15 K, 1 bar log10K: 7.74 ΔH°r: -102759 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 9.39 7.74 5.85 4.13 2.42 1.00 -0.25 -1.43