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TEM images. (A) A coesite nano-crystal observed in the amorphous silica grain recovered from the sample No. 1. The slice was recovered from FIB No. 1 of the sample in Fig. 3A (Upper). A SEAD pattern clearly indicates coesite. Coe, coesite. (B) Stishovite crystals observed in the same slice, FIB No. 1. A SEAD pattern indicates existence of stishovite. Sti, stishovite.
