Extended Data Fig. 8: STEM data on pyrrhotite from OREX-501044-100.
From: Mineralogical evidence for hydrothermal alteration of Bennu samples
(a) STEM-HAADF image showing sheet silicates contained within an embayment of pyrrhotite grain in OREX-501044-104. Local areas of the sheet silicates are conformal with the euhedral shape of the embayment. (b) STEM-HAADF image of a local area of a pyrrhotite grain containing a silicate inclusion (rectangular box). (c) Annular bright-field (ABF)-STEM image showing lattice fringes of the silicate inclusion within the pyrrhotite. (d–g) STEM-HAADF of the inclusion and EDS maps showing that it is a Mg silicate. The Mg/(Al+Si) ratio of the silicate is 0.62. Measurements of the lattice fringes indicate 0.3-nm d-spacing, consistent with Mg-rich saponite. The scale bars are 50 nm.
