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Earth, Planets and Space
Figure 3 | Earth, Planets and Space

Figure 3

From: The mineralogy and space weathering of a regolith grain from 25143 Itokawa and the possibility of annealed solar wind damage

Figure 3

Polynanocrystalline olivine rims on the front surface of RA-QD02-0115. (A) TEM bright-field image showing the approximately 34 nm thick, strongly diffracting rim (subsample 05). The rim continues unchanged under a surficial olivine particle. (B) TEM bright-field image of the rim (subsample 04). The carbon and platinum coating were applied during FIB preparation. (C) Corresponding TEM dark-field image. Bright areas in the rim are crystalline, dark areas may be amorphous or crystalline with non-diffracting orientations (as in the bulk olivine). (D) HR-TEM image of the rim (subsample 04) along the foil normal (α = β = 0°), some crystallites of the rim are seen along a <313 > zone axis. (E) HR-TEM image (subsample 04, slightly different location) along a <313 > zone axis of the bulk olivine (α = 2.2°, β = 0.7°). In (D) and (E), no large fractions of obviously amorphous regions can be seen, comparison of the tilted images suggests misorientations of the rim’s crystallites on the order of a few degrees.

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