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Rahul kumar Best Answer
Ferrosilite is Fe2Si2O6, Fayalite is Fe2SiO4, Quartz is SiO2 The minimum number of components which will make these three phases (quartz, ferrosilite, Fayalite) is 2 i.e. FeO and SiO2. So, the number of components= 2 Degree of freedom= C-P+2 = 2-3+2 = 1 i.e., the degree of freedom=1