(ahl' a veen) - A group of silicate minerals with a compositional range running from all magnesium - forsterite, Mg2SiO4 - to all iron - fayalite, Fe2SiO4 - common in pallasites, chondrites and some achondrites.
A shiny, green mineral found in many igneous rocks that have a high iron and magnesium content. In the presence of liquid water, olivine often alters to form other minerals (such as goethite, maghemite and hematite)
group of silicate minerals including forsterite and fayalite with the general formula (Mg, Fe, Mn, Ca)2SiO4 and usually dark green. Olivines are common minerals in basalts, peridotites and some other igneous rocks. Olivine is the dominant mineralogical constituent of the upper mantle.
Silicate mineral containing iron and magnesium. A green glassy mineral formed at high temperature. Common in basalt, especially ocean-floor basalt, and in ultramafic rocks. Gem-quality olivine is called peridote. Rock made up entirely of olivine is called dunite.
The mineral olivine (also called chrysolite and, when gem-quality, peridot) is a magnesium iron silicate with the formula (Mg,Fe)2SiO4. It is one of the most common minerals on Earth, and has also been identified on the Moon, Mars, and comet Wild 2.