Olivine: Solid solution series

It ranges in colour from chartreuse green to pale olive. In its gem form, it is called peridot.

Dunite contains (or has) over 90%+ olivine in it. Dunite and other peridotite rocks are major constituents of the Earth's mantle above a depth of about 400 kilometers. Dunite is rarely found on land, except where slabs of mantle rock from a subduction zone have been thrust onto continental crust. Olivine has also been found at several extraterrestrial locations, such as the moon and many passing space rocks - as well as the outer layers of dust orbiting young stars.

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  Light green olivine crystals in peridotite xenoliths in basalt from Arizona
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  Olivine basalt from the Moon, collected in 1971 by the crew of Apollo 15
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  Bright green olivine from Pakistan
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  Olivine in lava from the Azores
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  Olivine in cross-polarized light

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