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olivine

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olivine

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Olivine under a polarized microscope. It is a rock-forming mineral abundant in gabbros and basalts.

Greenish mineral, magnesium iron silicate, (Mg,Fe)2SiO4. It is a rock-forming mineral, present in, for example, peridotite, gabbro, and basalt. Olivine is called peridot when pale green and transparent, and used in jewellery.


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