Albite(low)

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: 
Stable below 700C with an ordered Si-Al arrangement
Geological context: 
A major constituent of granites and granite pegmatites, alkalic diorites, basalts, and in hydrothermal and alpine veins. A product of potassium metasomatism and in low-temperature and low-pressure metamorphic facies and in some schists. Detrital and authigenic in sedimentary rocks.

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
262.223 100.070 -3713043 -3936190 208.200 260.44
Reaction properties

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

298.15 K, 1 bar log10K: 2.74 ΔH°r: -82813 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 4.06 2.74 1.21 -0.21 -1.66 -2.93 -4.11 -5.30