Reports

First Natural Occurrence of Coesite

Science  22 Jul 1960:
Vol. 132, Issue 3421, pp. 220-222
DOI: 10.1126/science.132.3421.220

Abstract

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.