T. E BUNCH, ALVIN J COHEN; SHOCK DEFORMATION OF QUARTZ FROM TWO METEORITE CRATERS. GSA Bulletin ; 75 (12): 1263–1266. doi: https://doi.org/10.1130/0016-7606(1964)75[1263:SDOQFT]2.0.CO;2
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Quartz, in association with coesite and silica glass from two meteorite-impact sites, exhibits prominent cleavage. Individual quartz grains have a shattered appearance and are largely coherent with little or no rotation of cleaved segments. Cleavage was probably induced by brittle fracturing under shock loading and is similar to ruptures developed in quartz by static and shock-loading experiments. The degree of cleavage development and the texture of the shattered quartz is different from quartz deformed by other geologic processes.