Chao, Edward C. T. U.S. Geological Survey, Department of the Interior, Reston, Virginia.
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A naturally occurring mineral of wide interest, the high-pressure polymorph of SiO2. Coesite was first discovered and identified in various meteorite impact craters and in some tektites. Because it requires a unique physical condition, extremely high pressure, for its formation, its occurrence is diagnostic of a special natural phenomenon, in this case, the hypervelocity impact of a meteorite.
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