Olivinitic

olivine

[ol-uh-veen, ol-uh-veen]
noun
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.


Origin:
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)
 
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
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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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