- 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.
Origin of olivine
Also called chrysolite.
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Examples from the Web for olivine
Their essential constituents are olivine and purplish augite.
Below this is a more compact basalt, with crystals of olivine.A Manual of Elementary Geology
Section of olivine crystal from the lava of 1631—imperfectly formed.
Olivine is often present; and when abundant the rock is called "olivine-basalt."
Both are common alteration products of magnesian silicate minerals such as olivine, pyroxene, and amphibole.The Economic Aspect of Geology
C. K. Leith
- 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) 2 SiO 4 . Crystal structure: orthorhombicAlso called: chrysolite
- any mineral in the group having the general formula (Mg,Fe,Mn,Ca) 2 SiO 4
C18: from German, named after its colour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- 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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