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Olivines from dunites from the Mid-Atlantic Ridge.
Olivine is a mineral group with the general formula (Mg,Fe)2SiO4 and usually found in igneous rocks like gabbro, peridotite, basalt, and dunite. It's abundant in the mantle.
Informations from the 21st edition of the Manual of Mineralogy, by Klein and Hurlbut.
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