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Mineral speciesFormula
 CornetiteCu3PO4(OH)3 
Mineralogy
Family: Pseudomalachite Group, Cornetite - Clinoclase series 
Space group: Orthorhombic - Dipyramidal HM symbol (2/m 2/m 2/m) Space Group: P bca 
Dana class: 41.3.2.1VII - 41 Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen ; 41.3 Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen where (A B)3 (XO4) Zq ; 41.3.2 
Geological context
Geological context: A rare secondary mineral in the oxidized zone of some hydrothermal copper deposits. 
Thermodynamics
Individual properties
Molar weight: 336.631 g/mol  ΔGºf-1,567,745 J/mol ref.   
   
Reaction properties
Chemical reaction:  Cornetite + 5H+ = 3Cu+2 + H2PO4- + 3H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 1.47324989e+1   0.00000000e+0   0.00000000e+0   0.00000000e+0   0.00000000e+0 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)14.73
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  14.73   14.73   14.73   14.73   14.73   14.73   14.73   14.73 

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