The Mica Myth in Darjeeling Water
نویسنده
چکیده
Sir,?There is an impression amongst the visitors to Parjeeling that the water supplies contain mica, and is sometimes suggested that mica in the drinking Water causes irritation of the intestinal mucosa, with resultant diarrhoea. The water supply of Darjeeling is obtained from a number of perennial springs on the western slope of the Senchal range. The springs connect with a closed concrete conduit and deliver into a reservoir known as ' Senchal LakeA glance at a geological map of the Darjeeling Hill Territory shows that the western portion of the Darjeeling District, including the Senchal range, is constituted by gneiss. ' The gneiss of the Darjeeling District is of the foliated type, apparently a true gneiss composed of translucent colourless quartz, opaque white felspar and dark brown and silvery mica, varying in texture from fine-grained
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