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Mineral speciesFormula
 CorkitePbFe3(PO4)(OH)6SO4 
Mineralogy
Family: Alunite Group 
Space group: Trigonal - Ditrigonal Pyramidal HM symbol (3m) Space Group: R 3m 
Dana class: 43.4.1.2VII - 43 Compound Phosphates, etc. ; 43.4 Compound Phosphates, etc. (Anhydrous Compound Anions With Hydroxyl or Halogen) ; 43.4.1 
Geological context
High temperature: Corkite 
Geological context: An uncommon, low-temperature, secondary mineral occurring in the oxidized zones of hydrothermal base-metal deposits. 
Thermodynamics
Individual properties
Molar weight: 667.820 g/mol  ΔGºf-3,388,203 J/mol ref.   
   
Reaction properties
Chemical reaction:  Corkite + 8H+ = 3Fe+3 + H2PO4- + Pb+2 + SO4-2 + 6H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -1.94326743e+0   0.00000000e+0   0.00000000e+0   0.00000000e+0   0.00000000e+0 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-1.94
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  -1.94   -1.94   -1.94   -1.94   -1.94   -1.94   -1.94   -1.94 

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