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the olivine group (Mg, Fe)₂SiO₄, whose magnesium-rich and iron-rich end-members are considered separate minerals (forsterite and fayalite).

The details of these rules are somewhat controversial. For instance, there have been several recent proposals to classify amorphous substances as minerals, but they have not been accepted by the IMA.

The IMA is also reluctant to accept minerals that occur naturally only

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