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Peridot. - Is that what it's called?
橄榄石 -原来叫这个名?
Peridot (/ˈpɛrᵻdɒt/ or /ˈpɛrᵻdoʊ/) 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.
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