Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-25T15:52:18.485Z Has data issue: false hasContentIssue false
  • English
  • Français

Plagioclases from Sultan Hamud, Kenya

Published online by Cambridge University Press:  14 March 2018

P. M. Game
P. M. Game*
Affiliation:
Department of Mineralogy, British Museum
Get access Rights & Permissions [Opens in a new window]

Extract

The plagioclase which forms the subject of this investigation was presented by Dr. C. Stansfield Hitchen, director of the Kenya Geological Survey, who has kindly sent the following note of its occurrence:

‘The pale-green transparent felspar described in this note was found on the western slopes of a hill named Kioo, about 14 miles due north of Sultan Hamud station, Machakos district, Kenya Colony. From a description given by Messrs. D. Lyall and P. Cull, who found the mineral, it appears to have occurred in a small vein-like pegmatite sandwiched between parallel plates of decomposing mica. Towards the periphery of the enclosing mica plates the transparent felspar graded into opaque cream-coloured felspar of more normal appearance. The clear material was somewhat shattered and broke with many fragments on removal. The occurrence suggests a deuteric or possibly hydrothermal origin. Kyanite-gneisses occur in the vicinity.’

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 206 , September 1949 , pp. 682 - 687
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1949

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

page 682 note 1 Hey, M. H., On the presentation of chemical analyses of minerals. Min. Mag., 1939, vol. 25, pp. 402–412.CrossRefGoogle Scholar

page 684 note 1 Offret, A., Bull. Soc. Franç. Min., 1890, vol. 13, p. 654.Google Scholar Viola, C., Zeits. Kryst. Min., 1899, vol. 30, p. 438 Google Scholar; 1900, vol. 32, p. 320. Becke, F., Tsch. Min. Petr. Mitt., 1901, vol. 20, p. 71.Google Scholar Duparc, L. and Reinhard, M., Mém. Soc. Phys. Hist. Nat. Genève, 1924, vol. 40, p. 134 [M.A. 3–34].Google Scholar Winchell, A. N., Elements of optical mineralogy, New York, 1933, pt. 2, p. 333.Google Scholar Meen, V. B., Univ. Toronto Studies, Geol. Ser., 1933, no. 35, p. 37 [M.A. 5–439.]Google Scholar

page 684 note 2 Köhler, A., Tsch. Min. Petr. Mitt., 1941, vol. 53, p. 41. [M.A. 8–313.]Google Scholar

page 686 note 1 M. Reinhard, Universal Drehtischmethoden. Basel, 1931, pl. 2. [M.A. 4–435.]