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What is the chemocal formula for a peridot?

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What is the chemocal formula for a peridot?

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  1. Mg2Si04, or Fe2Si04 - these are the pure endmember formulae of peridot. Usually, though, since the mineral is formed by natural processes, the formula has variable amounts of both Mg and Fe, so you write it (Mg, Fe)2Si04.


  2. green crystal

  3. Magnesium/iron silicate, with Mg > Fe.

    See site below.

    Good luck!
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