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olivine

[ol-uh-veen, ol-uh-veen]

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noun

Mineralogy. any of a group of magnesium iron silicates, (Mg,Fe)₂SiO₄, occurring in olive-green to gray-green masses as an important constituent of basic igneous rocks.

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Also called chrysolite.

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

Related forms

ol·i·vin·ic

[ol-uh-vin-ik] , ol·i·vin·it·ic

[ol-uh-vi-nit-ik] , adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Olivine is always a great word to know.

So is quincunx. Does it mean:

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

a gadget; dingus; thingumbob.

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Collins

World English Dictionary

olivine (ˈɒlɪˌviːn, ˌɒlɪˈviːn)

—n
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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olivine

ol·i·vine