These chemical elements (Mg and Fe) are the essential components of olivine which has the following chemical formula: (Mg,Fe) 2 SiO 4. It is a mineral series — olivine is a magnesium iron silicate. G. Cressey, R.A. Howie, in Encyclopedia of Geology, 2005. May contain some PO4 replacing SiO4 (Schneider et al., 2013). Olivine is an important rock-forming mineral and occurs in mafic igneous rocks such as peridotite, gabbro, and basalt, along with pyroxene and plagioclase. The chemical formula for Fayalite is (Fe2SiO4). Equivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.Very common in volcanic rocks. General Olivine Information : Chemical Formula: (Mg,Fe)2SiO4 : Composition: Molecular Weight = 153.31 gm Magnesium 25.37 % Mg 42.06 % MgO: Iron 14.57 % Fe 18.75 % FeO: Silicon 18.32 % Si 39.19 % SiO 2: Oxygen 41.74 % O: 100.00 % 100.00 % = TOTAL OXIDE Chemical Formula: Mg 2 SiO 4 to Fe 2 SiO 4 ORIGIN: Olivine, more specifically, forsterite, is a mineral found in mafic and ultramafic igneous or metamorphic rocks. Olivine’s chemical formula is (Mg, Fe) 2 SiO 4, which, as stated before looks a little weird. The mineral olivine (also called chrysolite and, when gem-quality, peridot) is a magnesium iron silicate with the formula (Mg,Fe) 2 SiO 4.It is one of the most common minerals on Earth, and has also been identified in meteorites and on the Moon, Mars, and comet Wild 2. The chemical formula for Forsterite is (Mg2Si04). Introduction. Visit gemdat.org for gemological information about Olivine. Olivine is a common mineral in dark-colored igneous rocks because these rocks are rich in iron and magnesium (rocks rich in iron-bearing minerals tend to be either black or at least dark-colored). See also Olivine Group. While it will always have the silicate part (SiO 4 ), magnesium and iron trade places in the elemental front seat.

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