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Mineral speciesFormula
 Ferrotremolite(Ca2Fe5)Si8O22(OH)2 
Mineralogy
Family: Amphibole Group 
Space group: See temolite 
Dana class: See temolite 
Geological context
High temperature: "High" temperature mineral, its stability uper limit about 900C depends on aH2O,aCO2 and also Xfe. 
Geological context: Contact metamorphism of Ca rich rocks. 
Thermodynamics
Individual properties
Molar weight: 970.076 g/mol  ΔGºf-9,828,634 J/mol ref.  Sº: 684.08 J/mol/K ref. 
  ΔHºf-10,508,023 J/mol ref.  Cp: 707.90 J/mol/K ref. 
Reaction properties
Chemical reaction:  Ferrotremolite + 14H+ + 8H2O = 2Ca+2 + 5Fe+2 + 8H4SiO4 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -2.36585752e+3   -3.74232300e-1   1.43108230e+5   8.57894152e+2   -6.37366187e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)53.66
ΔH°r-430,891 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  60.59   53.66   45.78   38.66   31.64   25.93   20.95   16.24 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:828.14 J/mol/K 
b:246.65 J/mol/K2 
c:-172.26 J.K/mol 

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