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A suite of volcanic rocks from south-west Uganda containing kalsilite (a polymorph of KAlSiO4)

Published online by Cambridge University Press:  14 March 2018

Arthur Holmes
Arthur Holmes*
Affiliation:
University of Durham
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Extract

During the last few years large collections of rock specimens from the Toro-Ankole volcanic fields, east and south-east of Ruwenzori, have been sent to Durham by the Geological Survey of Uganda for petrological investigation. The specimens recently studied include representatives of a suite of highly potassic ultrabasic lavas. Some of these resemble melanocratic olivine-nephelinites or olivine-rich ankaratrites, but the nepheline-like felspathoid which they contain, instead of being nepheline, is a polymorph of KAlSiO4. For chemical reasons this mineral was at first thought to be kaliophilite. Other types, closely related, contain leucite, biotite, or melilite, in addition to the supposed kaliophilite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 26 , Issue 177 , June 1942 , pp. 197 - 217
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1942

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References

Bannister, (F. A.) and Hey, (M. H.). A chemical, optical, and X-ray study of nepheline and kaliophilite. Min. Mag., 1931, Vol 22, pp. 569–608.Google Scholar
Bannister, (F. A.) and Hey, (M. H.). Kalsilite, a polymorph of KAlSiO4, from Uganda. Min. Mag., 1942, vol. 26, pp. 218–224.Google Scholar
Brauns, (R.). Die phonolitischen Gesteine des Laacher Seegebietes und ihre Beziehungen zu anderen Gesteinen dieses Gebietes. Neues Jahrb. Min., 1922, vol. 46, pp. 1–116. [M.A. 2–122.]Google Scholar
Combe, (A. D.). Ann. Rep. for 1929, Geol. Surv. Uganda, 1930, pp. 16–18.Google Scholar
Combe, (A. D.). Ibid. for 1932, 1933, pp. 35–36.Google Scholar
Combe, (A. D.). Ibid. for 1933, 1934, pp. 63–69.Google Scholar
Combe, (A. D.). The Katunga volcano, south-west Uganda. Geol. Mag. London, 1937, vol. 74, pp. 195–200.CrossRefGoogle Scholar
Combe, (A. D.). Ann. Rep. for 1938, Geol. Surv. Uganda, 1939, pp. 17–19.Google Scholar
Cross, (W.). Igneous rocks of the Leucite Hills and Pilon Butte, Wyoming. Amer. Journ. Sci., 1897, ser. 4, vol. 4, pp. 115–141.Google Scholar
Dunham, (K. C.). Crystal cavities in lavas from the Hawaiian Islands. Amer. Min., 1933, vol. 18, pp. 369–385. [M.A. 6–131, 362.]Google Scholar
Hitchcock, (C. H.). Geology of Oahu. Bull. Geol. Soc. Amer., 1900, vol. 11, pp. 15–60.CrossRefGoogle Scholar
Holmes, (A.). Transfusion of quartz xenoliths in alkali basic and ultrabasic lavas, south-west Uganda. Min. Mag., 1936, vol. 24, pp. 408–421.Google Scholar
Holmes, (A.). The petrology of katungite. Geol. Mag. London, 1937, vol. 74, pp. 200–219. [M.A. 7–37.]Google Scholar
Holmes, (A.). A contribution to the petrology of kimberlite and its inclusions. Trans. Geol. Soc. South Africa, 1937, vol. 39 (for 1936), pp. 379–428. [M.A. 7–187.]Google Scholar
Holmes, (A.) and Harwood, (H. F.). Petrology of the volcanic fields east and south-east of Ruwenzori, Uganda. Quart. Journ. Geol. Soc. London, 1932, vol. 88, pp. 370–442.Google Scholar
Holmes, (A.) and Harwood, (H. F.). The petrology of the volcanic field of Bufumbira, south-west Uganda. Mem. Geol. Surv. Uganda, 1937, no. 3, pt. 2, 300 pp. [M.A. 7–37.]Google Scholar
Johannsen, (A.). A descriptive petrography of the igneous rocks. Chicago, 1938, vol. 4, p. 523. [M.A. 7–111.]Google Scholar
Lacroix, (A.). Les pegmatitoïdes des roches volcaniques à facies basaltique. Comp. Rend. Acad. Sci. Paris, 1928, vol. 187, pp. 321–326. [M.A. 4–47.]Google Scholar
Rodolico, (F.). Le zone vulcaniche di San Venanzo e di Cupaello. Boll. Soc. Geol. Ital., 1937, vol. 56, pp. 33–66.Google Scholar
Simmons, (W. C.). Petrology of some Uganda granites, with special reference to those associated with economic minerals. Bull. Geol. Surv. Uganda, 1939, no. 3, pp. 114–135.Google Scholar