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Jeffbenite, ideally Mg3Al2Si3O12, has been identified as inclusions in super-deep diamonds originating from depths that exceed 300 km. Although Mg-end member jeffbenite has limited stability at upper-mantle conditions, iron-bearing jeffbenite may have broader P–T stability that extends to the transition zone or uppermost lower mantle, incorporating...
Nixonite (IMA 2018-133), ideally Na2Ti6O13, is a new mineral found within a heavily-metasomatized pyroxenite xenolith from the Darby kimberlite field, beneath the west central Rae Craton, Canada. It occurs as microcrystalline aggregates, 15 to 40 μm in length. Nixonite is isostructural with jeppeite, K2Ti6O13, with a structure consisting of edge- a...
IMA No. 2018-133 Nixonite Na2Ti6O13 Darby kimberlite field, beneath the west central Rae Craton, ca. 200 km SW of the community of Kugaaruk, Nunavut, Canada (67°23’56.6”N, 93°21’13.9”W) Chiara Anzolini*, Fei Wang, Garrett A. Harris, Andrew J. Locock, Dongzhou Zhang, Steven D. Jacobsen and D. Graham Pearson *E-mail: email@example.com The Na analo...
Mapping the spatial distribution of water in the mantle transition zone (MTZ, 410- to 660-km depth) may be approached by combining thermodynamic and experimental mineral physics data with regional studies of seismic velocity and seismic discontinuity structure. HyMaTZ (Hydrous Mantle Transition Zone) is a Python program with graphical user interfac...