A simplified phase diagram of alkali feldspar system is shown below. The system shows a miscibility gap in solid-solution of solid at low temperatures. At high temperatures the diagram shows albite (Ab) or NaAlSi3O8 and orthoclase (Or) or KAlSi3O8 form a complete solid solution. a. Plot an estimated Gibbs Free Energy diagram as function of % Or for the phase diagram at 1200C. b. Plot an estimated Gibbs Free Energy diagram as function of \% Or for the phase diagram at 590C when the feldspar solid solution starts to separate into two solid phases, Ab and Or (use GAb for Ab phase and GOr for Or phase). c. How many degrees of freedom exist below 600C within the miscibility gap (exclude the solvus line)? d. What are the relative amounts of phases present at 300C for the composition x