[ol-uh-veen, ol-uh-veen]
Mineralogy. any of a group of magnesium iron silicates, (Mg,Fe) 2 SiO 4 , occurring in olive-green to gray-green masses as an important constituent of basic igneous rocks.
Also called chrysolite.

1785–95; < German Olivin, equivalent to Olive olive + -in -ine2

olivinic [ol-uh-vin-ik] , olivinitic [ol-uh-vi-nit-ik] , adjective
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World English Dictionary
olivine (ˈɒlɪˌviːn, ˌɒlɪˈviːn)
1.  Also called: chrysolite an olive-green mineral of the olivine group, found in igneous and metamorphic rocks. The clear-green variety (peridot) is used as a gemstone. Composition: magnesium iron silicate. Formula: (MgFe)2SiO4. Crystal structure: orthorhombic
2.  any mineral in the group having the general formula (Mg,Fe,Mn,Ca)2SiO4
[C18: from German, named after its colour]

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American Heritage
Science Dictionary
olivine   (ŏl'ə-vēn')  Pronunciation Key 
An olive-green to brownish-green orthorhombic mineral. Olivine is a common mineral in the igneous rocks, such as basalt and gabbro, that make up most of the Earth's crust beneath the oceans. Chemical formula: (Mg,Fe)2SiO4. ◇ Olivine in which the mafic component consists entirely of magnesium is called forsterite. Chemical formula: Mg2SiO4. ◇ Olivine in which the mafic component consists entirely of iron is called fayalite. Chemical formula: Fe2SiO4.
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Example sentences
Blues and greens indicate substances such as pyroxene and olivine, while warmer
  tones show clays and other materials.
The remainder was recovered from dolomite, magnesite, and olivine.
Unsurprisingly each is an instance of olivine from the source library.
We know that magma supplied from the hot spot to the volcanoes is chock-full of
  olivine crystals.
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