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Mineral speciesFormula
 Bornite(alpha)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-362,462 J/mol ref.  Sº: 415.43 J/mol/K ref. 
  ΔHºf-334,394 J/mol ref.  Cp: 245.60 J/mol/K ref. 
Reaction properties
Chemical reaction:  Bornite(alpha) + 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
 -3.47800499e+3   -5.52571057e-1   1.59116940e+5   1.26620768e+3   -1.13479751e+7 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-103.58
ΔH°r-3,526,815 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  -113.52   -103.58   -92.50   -82.70   -73.49   -66.75   -61.98   -59.10 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:208.20 J/mol/K 
b:146.77 J/mol/K2 
c:-5.65 J.K/mol 

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