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Secondary electron images of amorphous silica grain. (A) Amorphous silica grain, No. 1. The Kikuchi patterns of the two coesite grains, 1, and 2 are given in this figure. Two adjacent grains show a similar crystallographic orientation. FIB No. 1 indicates the slice prepared by FIB for TEM observation (see text and Fig. 4). (B) Amorphous silica grain, No. 2. The Kikuchi patterns of the grains 3 and 4 indicate that the two grains are quartz.
