Orthopyroxene

Thermodynamic Properties of Orthopyroxene Solid Solutions with general formula (Mg,Fe)2Si2O6

  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.
SiO2 FeO MgO
Wt % oxides:
Enstatite
Mg2Si2O6		 Ferrosilite
Fe2Si2O6
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 (1989) Importance of considerations of mixing properties in establishing an internally consistent thermodynamic database: thermochemistry of minerals in the system Mg2SiO4-Fe2SiO4-SiO2. Contributions to Mineralogy and Petrology 102, 41-68