Figure 2.

(a, b) BF STEM images of the CAI mantle edge composed of oriented gehlenite with minor fine-grained inclusions of hibonite and grossite. An inset in (a) is electron diffraction patterns of melilite view down the [130] zone axis, whereas an inset in (b) is electron diffraction patterns of grossite view down the [$\overline{3}\overline{1}2$] zone axis. (c) Compositional profile across a single melilite crystal in the CAI mantle, obtained using EPMA. The traverse was obtained along the elongation direction of the melilite crystal with a spacing of 2 μm between points. See Figure 1 for the location of the traverse line. Abbreviation: grs = grossite.