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Mineral speciesFormula
 Edenite(alpha)Na(Ca2Mg5)(AlSi7)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.10 (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 of amphibole ranges between 300C to 800C. It depends strongly on the figacity of water and pressure. 
Geological context: In intermediate plutonic igneous and medium-grade metamorphic rocks, as amphibolites and marbles. 
Thermodynamics
Individual properties
Molar weight: 834.252 g/mol  ΔGºf-11,880,543 J/mol ref.  Sº: 673.62 J/mol/K ref. 
  ΔHºf-12,589,150 J/mol ref.  Cp: 679.88 J/mol/K ref. 
Reaction properties
Chemical reaction:  Edenite(alpha) + 18H+ + 4H2O = Al+3 + 2Ca+2 + 5Mg+2 + Na+ + 7H4SiO4 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -3.14891062e+3   -4.85914121e-1   1.97575680e+5   1.13532685e+3   -8.55775585e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)81.91
ΔH°r-695,630 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  93.10   81.91   69.19   57.74   46.53   37.53   29.84   22.79 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:835.59 J/mol/K 
b:204.10 J/mol/K2 
c:-192.51 J.K/mol 

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