Spinel


Thermodynamic Properties of Spinel Solid Solutions with general formula (Fe2+,Mg)(Cr,Al,Fe3+)2O4-(Fe2+,Mg)2TiO4.


  1. Calculate Wt % oxides from mole fractions of endmembers.
  2. Calculate mole fractions of endmembers from Wt % oxides.
  3. Calculate thermodynamic properties from mole fractions of endmembers, T and P.
TiO2 Al2O3 Fe2O3 Cr2O3 FeO MgO
Wt % oxides:
Chromite
FeCr2O4
Hercynite
FeAl2O4
Magnetite
Fe3O4
Spinel
MgAl2O4
Ulvospinel
Fe2TiO4
Mole Fraction:

Calculation of Thermodynamic Properties require specification of temperature (T) and Pressure (P)

Input a temperature (C): .
Input a pressure (bars): .
Action: results or the form.

Sack RO, Ghiorso MS (1991a) An internally consistent model for the thermodynamic properties of Fe-Mg-titanomagnetite-aluminate spinels. Contributions to Mineralogy and Petrology 106, 474-505.

Sack RO, Ghiorso MS (1991b) Chromian spinels as petrogenetic indicators: thermodynamic and petrologic applications. American Mineralogist 76, 827-847.