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Secondary clay in Rajmahal basalts of India and its relation to palagonite-chlorophaeite

Published online by Cambridge University Press:  14 March 2018

T. R. Sarbadhikari  and
Santi Bhattacherjee
T. R. Sarbadhikari
Affiliation:
Department of Geology, Presidency College, Calcutta
Santi Bhattacherjee
Affiliation:
Department of Geology, Presidency College, Calcutta
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Summary

The mineralogy of the green, yellow, and brown secondary constituents occurring as amygdales, irregular infillings, and replacements in the Rajmahal basalts of eastern India and commonly described under the ill-defined names palagonite and chlorophaeite, has been revised on the basis of optical, X-ray, and thermal studies. The results indicate that these coloured constituents, which have been chiefly derived by the alteration of pyroxenes, iron ores, and primary glass, belong to the clay minerals, particularly smectite and vermiculite. This brings in question the validity of the terms palagonite and chlorophaeite which, though widely current in basaltic literature, have no definite mineralogical identity. It is suggested here that they are but forms of clay.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 273 , March 1966 , pp. 770 - 775
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1966

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References

Allen, (V. T.) and Scheid, (V. E.), 1946. Amer. Min., vol. 31, p. 294.Google Scholar
Dana, (E. S.), 1949. A text-book of Mineralogy. John Wiley, New York.Google Scholar
Fermor, (L. L.), 1925. Rec. Geol. Surv. Ind., vol. 58, p. 93.Google Scholar
Fermor, (L. L.), 1927. 1bid., vol. 60, p. 411.Google Scholar
Fermor, (L. L.), 1931. Geol. Mag., vol. 68, p. 266.Google Scholar
Fermor, (L. L.) and Fox, (C. S.), 1916. Rec. Geol. Surv. Ind., vol. 47, p. 94.Google Scholar
Macmohan, (C. A.), 1887. Rec. Geol. Surv. Ind., vol. 20, p. 104.Google Scholar
Middlemiss, (C. S.), 1889. 1bid., vol. 22, p. 226.Google Scholar
Peacock, (M. A.), 1930. Geol. Mag., vol. 67, p. 170.Google Scholar
Peacock, (M. A.) and Fuller, (R. E.), 1928. Amer. Mira, vol. 13, p. 360.Google Scholar
Sarbadhikari, (T. R.), 1958. Sci. and Cult., vol. 24, p. 185.Google Scholar
Sen, (N.), 1954. Quart. Journ. Geol. Min. Met. Soc. Ind., vol. 26, p. 1.Google Scholar
Wadia, (D. N.), 1925. Ree. Geol. Surv. Ind., vol. 58, p. 338.Google Scholar
Wilshire, (H. G.), 1958. Amer. Min., vol. 43, p. 120.Google Scholar
Winchell, (A. N.), 1951. Elements of Optical Mineralogy, Pt. 2. John Wiley, New York.Google Scholar