Peridot (/ˈpɛrɨdɒt/ or /ˈpɛrɨd/) is gem-quality olivine. Olivine is a silicate mineral with the formula of (Mg, Fe)2SiO4. As peridot is the magnesium-rich variety (forsterite) the formula approaches Mg2SiO4.

https://en.wikipedia.org/wiki/Peridot

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Carl Sagan
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