Sudoite

Formula : Mg2Al4Si3O10(OH)8

Space group: 
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Dana class: 
71.4.1.4 (71)Phyllosilicate Sheets of Six-Membered Rings (71.4)interlayered 1:1, 2:1, and octahedra (71.4.1)Chlorite group (Tri-Dioctahedral)
High temperature: 
Around 100C to 600C C according Fe,Mg, Al substitutions.
Geological context: 
Contact, hydrothermal, and regional metamorphism of mafic minerals. A product of low-grade metamorphism of Al, Mg-rich rocks.

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
 V°
cm3·mol-1
 ΔGºf
J·mol-1
 ΔHºf
J·mol-1
 Sº
J·mol-1·k-1
 CP
J·mol-1·K-1
536.845 205.100 (Ref.: 05vid/par) Vidal O., Parra T., Vieillard, P., 2005. Thermodynamic properties of the Tschermak solid solution in Fe-chlorite: Application to natural examples and possible role of oxidation. American Mineralogist 90, 347-358. -7995298 (Ref.: Internal calculation) -8655270 (Ref.: 05vid/par) Vidal O., Parra T., Vieillard, P., 2005. Thermodynamic properties of the Tschermak solid solution in Fe-chlorite: Application to natural examples and possible role of oxidation. American Mineralogist 90, 347-358. 390.500 (Ref.: 05vid/par) Vidal O., Parra T., Vieillard, P., 2005. Thermodynamic properties of the Tschermak solid solution in Fe-chlorite: Application to natural examples and possible role of oxidation. American Mineralogist 90, 347-358. 509.72 (Ref.: 05vid/par) Vidal O., Parra T., Vieillard, P., 2005. Thermodynamic properties of the Tschermak solid solution in Fe-chlorite: Application to natural examples and possible role of oxidation. American Mineralogist 90, 347-358.
CP(T) = a + b·T + ·c·T-2 (T in Kelvin)
a
J·mol-1·K-1
 b * 103
J·mol-1·K-2
 c * 10-5
J·K·mol-1
 Maier Kelley Ref.
557.84 351.23 -135.86 (Ref.: 05vid/par) Vidal O., Parra T., Vieillard, P., 2005. Thermodynamic properties of the Tschermak solid solution in Fe-chlorite: Application to natural examples and possible role of oxidation. American Mineralogist 90, 347-358.
Reaction properties

Sudoite + 16H+ ⇌ 4Al+3 + 2Mg+2 + 3H4SiO4 + 6H2O

298.15 K, 1 bar log10K: 37.96 ΔH°r:-523893 J·mol-1 (Ref.: 05vid/par) Vidal O., Parra T., Vieillard, P., 2005. Thermodynamic properties of the Tschermak solid solution in Fe-chlorite: Application to natural examples and possible role of oxidation. American Mineralogist 90, 347-358.
T(°C) 0 25 60 100 150 200 250 300
log10K 46.23 37.96 28.24 19.29 10.34 2.97 -3.51 -9.62
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-3803.983270 -0.563665 235067.677945 1357.571662 -12235862.315743