Chlorite(Cca-2)

Formula : (Mg2.964Fe1.927Al1.116Ca0.011)(Si2.633Al1.367)O10(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
617.095 211.830 (Ref.: 14bla/gai) Blanc, P., Gailhanou, H., Rogez, J., Mikaelian, G., Kawaji, H., Warmont, F., Grangeon, S., Greneche, J.M., Fialips, C.I., Giffaut, E., Gaucher, E.C., Claret, F., 2014, Thermodynamic properties of a chlorite and a berthierine by calorimetric methods: Physics and Chemistry of Minerals (accdepted) -7593265 (Ref.: Internal calculation) -8240140 (Ref.: 14bla/gai) Blanc, P., Gailhanou, H., Rogez, J., Mikaelian, G., Kawaji, H., Warmont, F., Grangeon, S., Greneche, J.M., Fialips, C.I., Giffaut, E., Gaucher, E.C., Claret, F., 2014, Thermodynamic properties of a chlorite and a berthierine by calorimetric methods: Physics and Chemistry of Minerals (accdepted) 469.190 (Ref.: 14bla/gai) Blanc, P., Gailhanou, H., Rogez, J., Mikaelian, G., Kawaji, H., Warmont, F., Grangeon, S., Greneche, J.M., Fialips, C.I., Giffaut, E., Gaucher, E.C., Claret, F., 2014, Thermodynamic properties of a chlorite and a berthierine by calorimetric methods: Physics and Chemistry of Minerals (accdepted) 546.95 (Ref.: 09gai/rog) Gailhanou, H., Rogez, J., van Miltenburg, J.C., van Genderen, A.C.G., Greneche, J.M., Gilles, C., Jalabert, D., Michau, N., Gaucher, E.C., Blanc, P., 2009. Thermodynamic properties of chlorite CCa-2. Heat capacities, heat contents and entropies. Geochimica et Cosmochimica Acta 73, 4738-4749.
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.
594.24 379.98 -142.75 (Ref.: 09gai/rog) Gailhanou, H., Rogez, J., van Miltenburg, J.C., van Genderen, A.C.G., Greneche, J.M., Gilles, C., Jalabert, D., Michau, N., Gaucher, E.C., Blanc, P., 2009. Thermodynamic properties of chlorite CCa-2. Heat capacities, heat contents and entropies. Geochimica et Cosmochimica Acta 73, 4738-4749.
Reaction properties

Chlorite(Cca-2) + 17.468H+ ⇌ 2.483Al+3 + 0.011Ca+2 + 1.712Fe+2 + 2.964Mg+2

298.15 K, 1 bar log10K: 61.34 ΔH°r:-627242 J·mol-1 (Ref.: 14bla/gai) Blanc, P., Gailhanou, H., Rogez, J., Mikaelian, G., Kawaji, H., Warmont, F., Grangeon, S., Greneche, J.M., Fialips, C.I., Giffaut, E., Gaucher, E.C., Claret, F., 2014, Thermodynamic properties of a chlorite and a berthierine by calorimetric methods: Physics and Chemistry of Minerals (accdepted)
T(°C) 0 25 60 100 150 200 250 300
log10K 71.30 61.34 49.77 39.21 28.76 20.28 12.95 6.14
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-3919.673541 -0.579067 245460.188687 1401.954165 -12325980.491072