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Mineral speciesFormula
 FerropargasiteNa(Ca2Fe4Al)(Al2Si6)O22(OH)2 
Mineralogy
Family: Amphibole Group 
Space group: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m 
Dana class: 66.1.3a.13 (66) Inosilicate Double-Width Unbranched Chains, W=2 (66.1) Dana Type (66.1.3a) Group 2, the calcic amphiboles 
Geological context
High temperature: Stability domain limited near 300C to more 600C is also limited to high pressure, several kbar. 
Geological context: In metamorphosed limestones and magmatc igneous rocks, metamorphosed ultramafic rocks,and in fresh magmatic igneous rocks. 
Thermodynamics
Individual properties
Molar weight: 961.993 g/mol  ΔGºf-10,569,566 J/mol ref.  Sº: 776.13 J/mol/K ref. 
  ΔHºf-11,242,757 J/mol ref.  Cp: 724.62 J/mol/K ref. 
Reaction properties
Chemical reaction:  Ferropargasite + 22H+ = 3Al+3 + 2Ca+2 + 4Fe+2 + Na+ + 6H4SiO4 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -3.62987602e+3   -5.78778981e-1   2.27719704e+5   1.30712889e+3   -9.94991460e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)83.81
ΔH°r-825,949 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  97.04   83.81   68.63   54.76   40.97   29.68   19.89   10.83 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:893.58 J/mol/K 
b:179.87 J/mol/K2 
c:-197.86 J.K/mol 

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