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Mineral speciesFormula
 FerrohexahydriteFeSO4:6H2O 
Mineralogy
Space group: Monoclinic - Prismatic HM symbol (2/m) Space Group: C 2/c 
Dana class: 29.6.8.3VI- 29 Hydrated Acid and Sulfates ; 29.6 Hydrated Acid and Sulfates where A XO4 . x(H2O) ; 29.6.8 Hexahydrite Group (Space Group: C2/c) 
Geological context
Geological context: In oxidized ore-bearing sandstone (Sofiya mine, Ukraine); a dehydration product of melanterite in drill cores (northeastern Tatarstan, Russia). 
Thermodynamics
Individual properties
Molar weight: 260.002 g/mol  ΔGºf-2,271,813 J/mol ref.  Sº: 368.00 J/mol/K ref. 
  ΔHºf-2,719,400 J/mol ref.   
Reaction properties
Chemical reaction:  Ferrohexahydrite = Fe+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
 -1.78602779e+3   -2.55703632e-1   9.65711207e+4   6.45086527e+2   -5.36764686e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-2.52
ΔH°r5,080 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  -2.58   -2.52   -2.37   -2.09   -1.67   -1.28   -1.04   -1.11 

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