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Science 10 October 1969:
Vol. 166. no. 3902, pp. 228 - 230
DOI: 10.1126/science.166.3902.228
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Articles

Coesite from the Richat Dome, Mauritania: A Misidentification

R. F. Fudali 1

1 Department of Mineral Sciences, Smithsonian Institution, Washington, D.C. 20560

The "shattered sandstone" from Richat reported to contain coesite is a tectonic breccia and probably represents a shear zone developed during the structural doming. An optical and x-ray examination of concentrates from this breccia demonstrated that the supposed x-ray reflections of coesite are actually due to barite, introduced into the permeable crushed zone by groundwater.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)