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What is the mineral in peridot(the birthstone)? Is it a mineral itself?

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What is the mineral in peridot(the birthstone)? Is it a mineral itself?

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  1. Peridot is the gem variety of olivine. Olivine, whose compositional solid solution series varies between two end member minerals: fayalite and forsterite. Fayalite is the iron rich member with a pure formula of Fe2SiO4. Forsterite is the magnesium rich member with a pure formula of Mg2SiO4. Olivine's formula is written as (Mg, Fe)2SiO4 to show the substitution of the magnesium and iron.

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