New answers tagged mineralogy
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Olivine is a solid solution between forsterite and fayalite, so it is generally expressed as molar percentages of these end-members, for instance Fo80Fa20. Often only one end-member is mentioned, as it is sufficient to infer the other (their sum is always 100 %).
It is the same with plagioclase, which is a solid solution between albite and anorthite and is ...
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