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Mineral speciesFormula
 Bornite(gamma)Cu5FeS4 
Mineralogy
Family: Betechtinite - Bornite series 
Space group: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca 
Dana class: 2.5.2.1 (2) Sulfides - Including Selenides and Tellurides (2.5) where Am Bn Xp, with (m+n):p=3:2 (2.5.2)Dana Group 
Geological context
High temperature: Magmatic to hydrothermal environments : medium to rether high temperature 
Geological context: Bornite occurs chiefly in mesotermal or magmatic hypogene deposits. 
Thermodynamics
Individual properties
Molar weight: 501.841 g/mol  ΔGºf-351,270 J/mol ref.  Sº: 408.39 J/mol/K ref. 
  ΔHºf-325,300 J/mol ref.   
Reaction properties
Chemical reaction:  Bornite(gamma) + 3H+ + 0.375H2O = 5Cu+ + Fe+2 + 3.75HS- + 0.125S2O3-2 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -3.43547572e+3   -5.48514858e-1   1.58059524e+5   1.25082428e+3   -1.13627269e+7 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-101.62
ΔH°r-3,535,909 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  -111.43   -101.62   -90.73   -81.16   -72.23   -65.75   -61.23   -58.56 

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