Discussion
Melting of pure enstatite leads to :
Answer: B
Melting pure enstatite produces forsterite + liquid.
In the system forsterite-silica at atmospheric pressure, enstatite (MgSiO\(_{3}\)) melts incongruently at about 1557 °C: it breaks down into crystals of forsterite (Mg\(_{2}\)SiO\(_{4}\)) and a liquid richer in silica than enstatite.
A liquid of enstatite composition would form only if melting were congruent, which it is not at low pressure. Fayalite is the iron end member of olivine and cannot form from pure magnesium enstatite.
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