An igneous rock contains sio2, al2o3, na2o, k2o, mno, cao and mgo. assuming that the degree of freedom is 2 , the number of minerals present in the rock is:

The number of minerals present = Number of phase (P) Given, Number of components (C) = 7 (sio2, al2o3, na2o, k2o, mno, cao and mgo) Degree of freedom (F) = 2 Using, F = C - P + ...