Home > Data consultation > Mineral species
 
Mineral speciesFormula
 CdSO4:8/3H2OCdSO4:2.67H2O 
Mineralogy
Space group: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n 
Dana class: 29.6.6.6 (29) Hydrated Acid and Sulfates (29.6) where A XO4 . x(H2O) (29.6.6) Rozenite Group (Monoclinic) 
Geological context
Geological context: Artificial, in natural environment a near unnamed phase exists CdSO4.4(H2O) belonging to the Rozenite group. Rozenite is supergene. 
Thermodynamics
Individual properties
Molar weight: 256.574 g/mol  ΔGºf-1,464,751 J/mol ref.  Sº: 229.65 J/mol/K ref. 
  ΔHºf-1,729,300 J/mol ref.  Cp: 213.33 J/mol/K ref. 
Reaction properties
Chemical reaction:  CdSO4:8/3H2O = Cd+2 + SO4-2 + 2.67H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -1.67185339e+3   -2.67918655e-1   9.17434964e+4   6.07213786e+2   -5.35223466e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-1.72
ΔH°r-19,126 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  -1.48   -1.72   -2.15   -2.70   -3.46   -4.33   -5.38   -6.78 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:117.10 J/mol/K 
b:392.03 J/mol/K2 
c:-18.36 J.K/mol 

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