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Mineral speciesFormula
 FaustiteZnAl6(PO4)4(OH)8:4H2O 
Mineralogy
Family: Turquoise Group 
Space group: Triclinic Pedial or Pinacoidal HM symbol (1 or -1) Space Group: P1 
Dana class: 42.9.3.3Hex ; 42.9 Hydrated Phosphates, etc., Containing Hydroxyl or Halogen where(?)3 (XO4)2 Zq . x(H2O) ; 42.9.3 
Geological context
Geological context: In argillized shales associated with copper mineralization (Copper King mine, Nevada, USA) 
Thermodynamics
Individual properties
Molar weight: 815.285 g/mol  ΔGºf-10,355,400 J/mol ref.   
   
Reaction properties
Chemical reaction:  Faustite + 16H+ = 6Al+3 + 4H2PO4- + Zn+2 + 12H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 1.96355013e+1   0.00000000e+0   0.00000000e+0   0.00000000e+0   0.00000000e+0 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)19.64
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  19.64   19.64   19.64   19.64   19.64   19.64   19.64   19.64 

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