Corundum(gamma)

Formula : Al2O3

Space group: 
Trigonal - Hexagonal Scalenohedral HM symbol (-3 2/m) Space Group: R 3c
Dana class: 
4.3.1.1
High temperature: 
High temperature mineral, related to metamorphisme and udersaturated magmas.
Geological context: 
Contact and regionally metamorphosed rocks but also in magma with low silica content (alkaline context)

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
101.961 20.420 -1563869 -1656900 52.300 82.77
Reaction properties

Corundum(gamma) + 6H+ ⇌ 2Al+3 + 3H2O

298.15 K, 1 bar log10K: 21.52 ΔH°r: -277390 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 25.94 21.52 16.39 11.64 6.83 2.85 -0.62 -3.81