- 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
Examples from the Web for olivine
Historical Examples of 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
Olivine is often present; and when abundant the rock is called "olivine-basalt."
Section of olivine crystal from the lava of 1631—imperfectly formed.
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
Word Origin for olivine
- 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.