Fig. 1
From: An Almahata Sitta EL3 fragment: implications for the complex thermal history of enstatite chondrites
a Photomicrograph (transmitted plane-polarized light) of a thin section of MS-177 containing abundant sharply bounded chondrules. The section shows a darkened appearance. b Backscattered electron (BSE) image of the MS-177 section showing abundant spherical chondrules (dark) with well-defined outlines. Opaque minerals (mainly Fe–Ni metal and troilite) (bright) are abundant in MS-177. c Combined elemental map in Mg (red), Ca (green), and Al (blue) showing a high abundance of diopside (light green) in chondrules and as isolated minerals. d Reflected light photomicrograph of a part of MS-177 containing chondrules and isolated minerals. Fine-grained Fe–Ni metal and troilite (bright grains) are abundantly distributed in silicate minerals resulting in the darkened appearance