Albite(high)

Formula : NaAlSi3O8

Space group: 
Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: C1
Dana class: 
76.1.3.1 (76) Tectosilicate Al-Si Framework (76.1) with Al-Si frameworks (76.1.3) Plagioclase series
High temperature: 
Low temperature mineral, zeolite facies, low temperature mineral, its break-down temperature around 200C in albite depends on water partial pressure and its Si and Al content.
Geological context: 
The differences between high and low albite are based on the Si-Al disordering process. To summarize, the Analbite is a high (-temperature) albite completely disordered and the low abite is a low-temperature albite fully ordered. No data are available about polymorphs occurences : see Albite.

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
262.223 100.430 -3705063 -3923380 224.400 204.82
Reaction properties

Albite(high) + 4H+ + 4H2O ⇌ Al+3 + Na+ + 3H4SiO4

298.15 K, 1 bar log10K: 4.14 ΔH°r: -95623 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 5.67 4.14 2.39 0.81 -0.75 -2.04 -3.21 -4.34