Amesite

Formula : Mg4Al2(Al2Si2)O10(OH)8

Space group: 
Triclinic - Pedial H-M Symbol (1) Space Group: C1
Dana class: 
7.1.2c.1 (71) Phyllosilicate Sheets of Six-Membered Rings (71.1) with 1:1 layers(71.1.2c)Serpentine group (Amesite subgroup)
High temperature: 
Based on the chlorite s.l., chlorite may be stable from about 100C to 600C and more with the increase of the pressure.
Geological context: 
A product of low-grade metamorphism of Al, Mg-rich rocks.

Dernière mise à jour le 19.12.2017

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
cm3·mol-1
ΔGºf
kJ·mol-1
ΔHºf
kJ·mol-1
J·mol-1·k-1
CP
J·mol-1·K-1
557.370 205.200 -8.365.841 -9.035.900 403.200 516.34
Reaction properties

Amesite + 20H+ ⇌ 4Al+3 + 4Mg+2 + 2H4SiO4 + 10H2O

298.15 K, 1 bar log10K: 69.40 ΔH°r: -766388 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 81.69 69.40 55.33 42.55 29.88 19.55 10.60 2.33