Amesite(Fe)

Formula : Fe4Al2(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: 
Around 100C to 600C C according Fe,Mg, Al substitutions.
Geological context: 
A product of low-grade metamorphism of Al, Mg-rich 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
683.538 209.000 -6977055 -7607460 514.800 540.47
Reaction properties

Amesite(Fe) + 20H+ ⇌ 4Al+3 + 4Fe+2 + 2H4SiO4 + 10H2O

298.15 K, 1 bar log10K: 57.03 ΔH°r: -686828 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K 68.03 57.03 44.41 32.89 21.40 11.96 3.69 -4.04