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Majorite is a mineral found in the mantle of the Earth. Its chemical formula is Mg 3 (MgSi) (SiO 4) 3. It is a type of garnet, distinguished from other garnets in having silicon in octahedral as well as tetrahedral coordination.
Environment: Formed from low-calcium, high-aluminum pyroxene, olivine, and shock-induced glass, by high-pressure impact metamorphism in bolides. IMA Status: Approved IMA 1970. Locality: In the Coorara, Catherwood, Pampa del Infierno, Tenham, and Peace River chondritic meteorites. Link to MinDat.org Location Data.
Majorite is a mineral found in the mantle of the Earth. Its chemical formula is Mg 3 (MgSi)(SiO 4) 3. It is a type of garnet, distinguished from other garnets in having silicon in octahedral as well as tetrahedral coordination.
Majorite is a phase in the mantle that is related to garnet. Majorite is named after Alan Major, who synthesized this particular type of garnet at pressures of more than 6 GPa at the Australian National University in the late 1960s (Ringwood and Major, 1971).
Nov 28, 2014 · MgSiO 3 -perovskite is now called bridgmanite. The associated phase assemblage constrains peak shock conditions to ~ 24 gigapascals and 2300 kelvin. The discovery concludes a half century of efforts to find, identify, and characterize a natural specimen of this important mineral.
- Oliver Tschauner, Chi Ma, John R. Beckett, Clemens Prescher, Vitali B. Prakapenka, George R. Rossman
- 2014
Majorite normally occurs only at a depth of several hundred kilometres under very high pressures and temperatures. The Bonn researchers have now succeeded in demonstrating that, under these conditions, the mineral stores oxygen and performs an important function as an oxygen reservoir.
Apr 7, 2017 · Here, we report the discovery of a high-pressure Fe 3+-rich majorite in an orogenic carbonatite from the Trans–North China Orogen (TNCO) formed at the end of oceanic subduction during the Paleoproterozoic era (~1.85 Ga) . This is the first conclusive finding of majorite in an eclogite xenolith, and its formation depth and mineral chemistry ...