Question: Please provide an explanation and provide the subscripts in the same format as Ca, Na and Mg. The generic formula of pyroxene is XYSi2O6. According
Please provide an explanation and provide the subscripts in the same format as Ca, Na and Mg. The generic formula of pyroxene is XYSi2O6. According to the generic formula, Fe and Al should have the y letter. I think it should be (1-y)/2 for both Fe and Al but I cannot put more than 4 values, so I can only enter 1-y/2 but that would be a different result. Thank you 
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(Al(Si2O6
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