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. 2019 Nov 20;5(11):eaax5078. doi: 10.1126/sciadv.aax5078

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 4 — (A to C) BF-TEM images of UPLs show that amorphous silicates (Amo) contain various quantities of small Fe─Ni sulfide (Sulf) inclusions and that pores are partially filled with spongy organics (OM). The 2D SAED pattern of the amorphous silicate in (C) contains weak rings of ~0.15 and ~0.25 nm. A BF-TEM image of an enstatite (En) whisker in UPL (D) shows that it is elongated along the crystallographic a axis. The enstatite and forsterite (Fo) in (C) are surrounded by thin, Fe-rich layers, indicated by black arrows. A BF-TEM image of the matrix (E) shows that it mainly consists of densely packed amorphous silicates with Fe─Ni sulfide inclusions. The interspaces between the amorphous silicate grains are filled with poorly crystallized phyllosilicates with a d spacing of ~0.7 nm (F).