Extended Data Fig. 3: Multiphase inclusion interpreted as former low-Ca, high-Na majoritic garnet. | Nature

Extended Data Fig. 3: Multiphase inclusion interpreted as former low-Ca, high-Na majoritic garnet.

From: Blue boron-bearing diamonds from Earth’s lower mantle

Extended Data Fig. 3

a, Optical microscope image of the inclusion, exposed on a polished facet of sample 880000037816. b, Secondary-electron image of the same inclusion, grooved with nearly horizontal polishing lines. c, d, EDS spectra of the two phases, consistent with their Raman identification as jeffbenite and NaAl-pyroxene (monoclinic, with composition between enstatite and jadeite). High Na content suggests a metabasaltic paragenesis, while low Ca content may reflect Ca partitioning into coexisting Ca-Pv at the base of the mantle transition zone or the uppermost lower mantle.

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