Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Twinned Epidote from the Epidote-Biotite Gneiss of Omalur, Salem District, Tamil Nadu


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1 Geology Department, University of Madras, Madras, India
 

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This note deals with twinned epidote found in epidote-biotite gneiss from Periya Soragai (Lat. N11°44'; Long. E77°55') west of Omalur, Salem District. The volume percent of the different minerals in the rock is: quartz-29%, plagioclase (27% to 29% An)-27%, biotite (pleochroic from pale yellow to greenish-brown)-26%, epidote (non-pleochroic)-16% and opaque oxide-2%. Few of the epidote grains are found to be twinned (Fig. 1).
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  • Twinned Epidote from the Epidote-Biotite Gneiss of Omalur, Salem District, Tamil Nadu

Abstract Views: 195  |  PDF Views: 132

Authors

K. C. Rajasekaran
Geology Department, University of Madras, Madras, India
V. Ram Mohan
Geology Department, University of Madras, Madras, India

Abstract


This note deals with twinned epidote found in epidote-biotite gneiss from Periya Soragai (Lat. N11°44'; Long. E77°55') west of Omalur, Salem District. The volume percent of the different minerals in the rock is: quartz-29%, plagioclase (27% to 29% An)-27%, biotite (pleochroic from pale yellow to greenish-brown)-26%, epidote (non-pleochroic)-16% and opaque oxide-2%. Few of the epidote grains are found to be twinned (Fig. 1).