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Mineral speciesFormula
 GalenaPbS 
Mineralogy
Family: Galena Group 
Space group: Isometric - Hexoctahedral HM symbol (4/m -3 2/m) Space Group: F m3m 
Dana class: 2.8.1.1II- 2 Sulfide Minerals ; 2.8 Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=1:1 ; 2.8.1 Galena Group (Isometric: Fm3m) 
Geological context
High temperature: Temperatures stability range estimated from hydrothermal systems is around 200 to 300C. 
Geological context: A widespread sulphur, occurs comonly in sedimentary rocks, hydrothermal systems, contact metamorphic deposits. 
Thermodynamics
Individual properties
Molar weight: 239.266 g/mol  ΔGºf-96,676 J/mol ref.  Sº: 91.34 J/mol/K ref. 
  ΔHºf-98,320 J/mol ref.  Cp: 49.44 J/mol/K ref. 
Reaction properties
Chemical reaction:  Galena + H+ = Pb+2 + HS- 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -9.25594474e+2   -1.47834729e-1   4.66739340e+4   3.36543893e+2   -3.06373158e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-14.84
ΔH°r-785,832 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  -16.21   -14.84   -13.36   -12.12   -11.03   -10.33   -9.96   -9.94 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:46.77 J/mol/K 
b:9.42 J/mol/K2 
c:-0.12 J.K/mol 

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