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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Sushmita
Dear Amy... Here, we subtract 6 moles of SiO2 (6×7.89%=47.34%), because this quartz amount is use for formation of potash feldspar (K-feldspar), so we need to subtract this amount from total quartz amount for finding the mole % of quartz in granite.