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Asif ali
If you solve ACF for K-Feldspar. KAlSi3O8 then Let's Assume 2KAlSi3O8 = K2O+Al2O3+6Sio2. using this in A = 1+0-0-1 =0. If you taking one molecules only KAlSi3O8 = 1/2K2O+1/2Al2O3+ some SiO2. so use in A = 0.5+0-0-0.5=0