Abstract
The quartz-cristobalite transformation in heated natural chert (flint) rock composed of micro- and ŗypto-quartz was investigated in the temperature interval of 1000–1300°C by micro-Raman spectroscopy, FT-IR spectroscopy, X-ray diffraction and Scanning Electron Microscopy. A small amount of crystobalite was first observed in the chert after heating at 1000°C for 1 h and the transformation was almost completed after heating at 1300°C for 24 h. On the other hand, cristobalite was not detected in well-crystallized pure quartz after heating under the same conditions. The transformation occurs as a solid state nucleation and crystal growth of cristobalite replacing quartz at high-temperatures. The chert rock is naturally rich in crystal defects and boundaries which serve as nucleation sites and enable an earlier quartz-cristobalite transformation.
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Dedicated to Prof. Menachem Steinberg on the occasion of his 65th birthday
The work was carried out while the first author was on sabbatical at the University Claude Bernard Lyon 1, France. The first author expresses his appreciation to G. Boulon and M. Boudeulle of this Institute for their hospitality and useful discussions. The support of the University Claude Bernard is gratefully acknowledged. The authors thank Dr. Jacob Nathan of the Geological Survey of Israel for the use of the XRD instrument and many helpful discussions. The reviewers of the manuscript are thanked.
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Shoval, S., Champagnon, B. & Panczer, G. The quartz-cristobalite transformation in heated chert rock composed of micro and crypto-quartz by Micro-Raman and FT-IR spectroscopy methods. Journal of Thermal Analysis 50, 203–213 (1997). https://doi.org/10.1007/BF01979562
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DOI: https://doi.org/10.1007/BF01979562