Last updated 09/07/24: Online ordering is currently unavailable due to technical issues. We apologise for any delays responding to customers while we resolve this. For further updates please visit our website: https://www.cambridge.org/news-and-insights/technical-incident
We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
Published online by Cambridge University Press: 14 March 2018
Dana classifies gümbelite in the kaolin division under pyrophyllite, and expresses the view that it may be an impure pyrophyllite. The present study, however, has shown that the unit cell of gümbelite is very similar to that of muscovite. Also the chemical analysis reveals a Closer similarity to muscovite, particularly to a variety called hydromuscovite.
page 11 note 1 Dana, , Descriptive mineralogy, 6th edition, New York, 1892.Google Scholar
page 11 note 2 Timofeev, V. M., Trav. Soc. Nat. Leningrad, 1925, vol. 55, part 1, pp. 95–101. A description in English of the occurrence in the shungite deposit is given, with a map, in the XVII International Geological Congress guide-book ‘The Northern Excursion, The Karelian ASSR’, 1937, p. 55. See also V. M. Timofeev, The petrography of Karelia, 1935 [M.A. 7-197.]Google Scholar
page 13 note 1 Brammall, A., Leech, J. G. C., and Bannister, F. A., Min. Mag., 1937, vol. 24, pp. 507–520.CrossRefGoogle Scholar
