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Science 22 July 1960:
Vol. 132. no. 3421, pp. 220 - 222
DOI: 10.1126/science.132.3421.220
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Articles

First Natural Occurrence of Coesite

E. C. T. Chao 1, E. M. Shoemaker 1, and B. M. Madsen 1

1 U.S. Geological Survey, Washington, D.C.

Coesite, the high-pressure polymorph of SiO2, hitherto known only as a synthetic compound, is identified as an abundant mineral in sheared Coconino sandstone at Meteor Crater, Arizona. This natural occurrence has important bearing on the recognition of meteorite impact craters in quartz-bearing geologic formations.


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Stishovite: Thermal Dependence of the Crystal Habit.
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