Abstract

Standard free energies of formation

(ΔGf°)
for five primary rock-forming silicate minerals were calculated from their dissolution in aqueous solutions, using (1) the actual mineral formulas derived from the chemical analyses of the specific mineral samples, and (2) the ideal structural formulas of the minerals. AGf° (kcal/mole) is:

Actual FormulaIdeal Formula
Olivine -461.6 -457.8 
Augite -679.4  
Labradorite -932.4 -931.1 
Micro cline -887.3 -892.6 
Muscovite -1399.9 -1313.8 
Actual FormulaIdeal Formula
Olivine -461.6 -457.8 
Augite -679.4  
Labradorite -932.4 -931.1 
Micro cline -887.3 -892.6 
Muscovite -1399.9 -1313.8 

The standard free energy of formation for Fe(OH)+ was also calculated to be —52.58 kcal/mole.

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