[ol-uh-veen, ol-uh-veen] /ˈɒl əˌvin, ˌɒl əˈvin/
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.
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 Also called chrysolite
any mineral in the group having the general formula (Mg,Fe,Mn,Ca)2SiO4
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.
olivipetal ol·i·vip·e·tal (ŏl’ə-vĭp’ĭ-tl) adj. In a direction toward the olivary body.
olivopontocerebellar ol·i·vo·pon·to·cer·e·bel·lar (ŏl’ə-vō-pŏn’tō-sěr’ə-běl’ər) adj. Relating to the olivary nucleus, the pons, and the cerebellum.
- Olivopontocerebellar atrophy
olivopontocerebellar atrophy n. A progressive neurologic disease marked by loss of neurons in the cerebellar cortex, the pons, and the olivary nucleus.