What are the correct subscripts for Fe and Al in the following pyroxene formula and how can we use the obtained formula to calculate the percentage of jadeite, diopside and hedenbergite? Don't use the x and y values of 0.9 and 0.8 to answer the first part of the question, the x and y values must be applied only after finding the correct subscripts. If you cannot answer to 7 in the same question, please answer only 6 for now and I will create a new question for 7

6. What are the correct subscripts for Fe and Al in the following pyroxene formula? ( 2 credits) Highlight and replace the question marks (?) with your answers. CaxNa(1x)MgyFe,Al1,Si2O6 7. Calculate the proportions of jadeite ( (aAlSi 2O6), diopside ( CaMgSi2O6 ) and hedenbergite ( CaFeSi2O6 ) in this pyroxene with x=0.9 and y=0.8. (2 credits) Highlight and replace the question mark (?) with your answers. Jadeite (NaAlSi2O6)% Diopside (CaMgSi2O6) \% Hedenbergite (CaFeSi2O6)%