Discussion
Which one of the following compositions correctly represents forsterite ?
Answer: B
The keyed answer is MgSiO4, the option that names the magnesium end-member.
Forsterite is the pure magnesium olivine. Its true formula is Mg2SiO4, two magnesium ions to each silica tetrahedron, and none of the printed options gives the subscript 2 correctly in this position. Option B is the only one that contains magnesium alone with an SiO4 group, so it is the formula the key accepts.
Option C, with iron alone, stands for fayalite, the iron end-member (Fe2SiO4). Option D, with both Mg and Fe, stands for the olivine solid solution between them, not forsterite. Option A has a pyroxene-type SiO3 group, so it is not an olivine at all.
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