Monticellite Mineral Data
General Monticellite Information. Chemical Formula: CaMgSiO4. Composition: Molecular Weight = 156.47 gm. Calcium 25.61 % Ca 35.84 % CaO. Magnesium 15.53 % Mg 25.76 % MgO.
General Monticellite Information. Chemical Formula: CaMgSiO4. Composition: Molecular Weight = 156.47 gm. Calcium 25.61 % Ca 35.84 % CaO. Magnesium 15.53 % Mg 25.76 % MgO.
Monticellite is a calcic-olivine and forms a solid solution to kirschsteinite, the Fe-rich endmember; it occurs in two distinct parageneses: it is as common mineral developed during progressive metamorphism of siliceous and magnesian limestone, and in skarn zone at metasomatized limestone contacts with acid, alkaline and basic intrusions.
Monticellite and kirschsteinite (commonly also spelled kirschteinite ) are gray silicate minerals of the olivine group with compositions Ca Mg Si O 4 and CaFeSiO 4, respectively.Most monticellites have the pure magnesium end-member composition but rare ferroan monticellites and magnesio-kirschsteinite are found with between 30 and 75 mol.% of the iron end member.
An Adirondack marble contains the assemblage calcite-diopside-forsterite-monticellite, with trace amounts of zincian spinel, titanian andradite, idocrase, and sphalerite. Microprobe analyses indicate that the monticellite and forsterite both have Mg/(Mg+ Fe) greater than 0.9, and that monticellite is more iron-rich than coexisting forsterite.
Monticellite, grayish silicate mineral in the olivine family, calcium and magnesium silicate (CaMgSiO4), that occurs as small crystals or grains in metamorphosed siliceous dolomites, in contact skarn zones (of contact-metamorphic rock rich in iron), and, more rarely, in igneous rocks such as
Monticellite: Sharp Z D, Hazen R M, Finger L W (1987) High-pressure crystal chemistry of monticellite, CaMgSiO4 American Mineralogist 72 748-755: 1987: 1.11: 293: 0001099: Monticellite: Sharp Z D, Hazen R M, Finger L W (1987) High-pressure crystal chemistry of monticellite, CaMgSiO4 American Mineralogist 72 748-755: 1987: 2.07: 293: 0001100 ...