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Science 22 August 1975:
Vol. 189. no. 4203, pp. 631 - 632
DOI: 10.1126/science.189.4203.631
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Articles

High Cristobalite and High Tridymite in a Middle Eocene Deep-Sea Chert

John A. Klasik 1

1 Department of Geology, Louisiana State University, Baton Rouge 70803

The high-temperature forms of cristobalite and tridymite have been found occurring in a Middle Eocene, radiolarian-rich claystone. Evidence indicates that these crystals formed at low temperature and were chemical precipitates. Scanning electron microscopy, energy-dispersive x-ray analysis (microprobe), and x-ray diffraction provided the data upon which the determinative mineralogy was based.

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