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Mineral speciesFormula
 Chlorite(Cca-2)(Mg2.964Fe1.927Al1.116Ca0.011)(Si2.633Al1.367)O10(OH)8 
Mineralogy
Family: Chlorite Group 
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) 
Geological context
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. 
Thermodynamics
Individual properties
Molar weight: 617.095 g/mol  ΔGºf-7,593,265 J/mol ref.  Sº: 469.19 J/mol/K ref. 
  ΔHºf-8,240,140 J/mol ref.  Cp: 546.95 J/mol/K ref. 
Reaction properties
Chemical reaction:  Chlorite(Cca-2) + 17.468H+ = 2.483Al+3 + 0.011Ca+2 + 1.712Fe+2 + 2.964Mg+2 + 2.633H4SiO4 + 0.215Fe+3 + 7.468H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -3.05389137e+3   -4.79412445e-1   1.88188084e+5   1.09917564e+3   -8.25562358e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)61.33
ΔH°r-612,127 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  71.50   61.33   49.72   39.22   28.85   20.43   13.13   6.36 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:594.24 J/mol/K 
b:379.98 J/mol/K2 
c:-142.75 J.K/mol 

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