Abstract
THE following three Indian vermiculite samples: (i) Bagespura, (ii) Malavanghatta and (iii) Hazaribagh have been examined by X-ray and differential thermal analysis. The samples are of flaky habit and exfoliate on heating. All the samples give a basal reflexion of 14 Å, which collapses to 9.6 Å on heating to 750° C. In the differential thermal analysis curves (Fig. 1) there are two sharp water-loss peaks at 150° and 250° C, similar to true vermiculites. In each of the samples (i) and (ii) there is an additional endothermic peak at about 100° C, perhaps due to absorbed water. In all the samples there is an endothermic peak near 900° C.
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References
Barshad, I., Amer. Min., 33, 665 (1948).
Gruner, J. W., Amer. Min., 19, 557 (1934).
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SINHA, P. Appearance of Exothermic Peak in the Differential Thermal Curves of Vermiculites. Nature 196, 765 (1962). https://doi.org/10.1038/196765a0
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DOI: https://doi.org/10.1038/196765a0
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