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  • Title: Discovery of natural MgSiO3 tetragonal garnet in a shocked chondritic meteorite.
    Author: Tomioka N, Miyahara M, Ito M.
    Journal: Sci Adv; 2016 Mar; 2(3):e1501725. PubMed ID: 27051873.
    Abstract:
    MgSiO3 tetragonal garnet, which is the last of the missing phases of experimentally predicted high-pressure polymorphs of pyroxene, has been discovered in a shocked meteorite. The garnet is formed from low-Ca pyroxene in the host rock through a solid-state transformation at 17 to 20 GPa and 1900° to 2000°C. On the basis of the degree of cation ordering in its crystal structure, which can be deduced from electron diffraction intensities, the cooling rate of the shock-induced melt veins from ~2000°C was estimated to be higher than 10(3)°C/s. This cooling rate sets the upper bound for the shock-temperature increase in the bulk meteorite at ~900°C.
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