Biotite

Thermodynamic Properties of Biotite Solid Solutions with general formula K(Fe,Mg)3Si3AlO10(OH)2

  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 Al2O3 FeO MgO K2O H2O
Wt % oxides:
Annite
KFe3Si3AlO10(OH)2		 Phlogopite
KMg3Si3AlO10(OH)2
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