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Isokite, CaMgPO4F, a new mineral from Northern Rhodesia

Published online by Cambridge University Press:  14 March 2018

T. Deans ,
J. D. C. McConnell  and
R. Pickup
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Abstract

The mineral, for which the name isokite is now proposed, occurs in the carbonatite plug which forms Nkumbwa Hill Oat. 10° 10' S. long. 32° 51' E.), 15 miles east of Isoka (pronounced Iso̅ka) in Northern Rhodesia. A preliminary account of this interesting mineral locality has already been published (Reeve and Deans, 1954) and a more detailed account is now in preparation, so that only the main features of the occurrence need be mentioned here. The carbonatite plug or pipe, 0.6 by 1 mile across and rising to a height of 1000 feet above the surrounding country, pierces granitic and micaceous gneisses which are fenitized to a distance of 500 yards from the walls of the pipe, but, unlike the classic carbonatite complexes, no intrusive alkalic rocks are exposed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 230 , September 1955 , pp. 681 - 690
Copyright
Copyright © 1955, The Mineralogical Society

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References

Eckermann, (H.von), 1948. The alkaline district of Aln6 island. Sveriges Geol. UndersSk., Ser. Ca., no. 36, 176 pp. []∼f.A. 11-27.]Google Scholar
Kokkoros, (P.), 1938. Über die Struktur des Durangit NaA1F(AsO∼). Zeits. Krist., vol. 99, pp. 3849. [M.A. 7-237.]Google Scholar
Reeve, (W.H.) and Deans, (T.), 1954. An occurrence of carbonatite in the Isoka district of Northern Rhodesia. Colonial Geol. Min. Res. London, vol. 4, pp. 271–281. [M.A. 12537.]Google Scholar
Richmond, (W.E.), 1940. Crystal chemistry of the phosphates, arsenates and vanadates of the type A2XQ(Z). Amer. Min., vol. 25, pp. 441–479. [M.A. 8-11.]Google Scholar
Sahama, (Th. G.), 1945. Abundance relation of fluorite and sellaite in rocks. Ann. Aead. Sci. Fennieae, set. A, III, no. 9, 20 pp. [M.A. 9258.]Google Scholar
Sahama, (Th. G.), 1946. On the chemistry of the mineral titanite. Compt. Rend. Soe. G∼ol. Finlande, no. 19 (Bull. Comm. Géol. Finlande, no. 138), pp. 88–120. [M.A. 10-302.]Google Scholar
Scacchi, (A.), 1888. Sopra un frammento di antiea roecia vuleanica inviluppato nella lava Vesuviana del 1872. Atti Accad. Sci. Napoli, ser. 2, vol. 1, no. 5.Google Scholar
Strunz, (H.), 1937. Titani und Tilasit. Uber die Verwandtschat der Silikate mit den Phosphaten und Arsenaten. Zeits. Krist., vol. 96, pp. 7–14. [M.A. 7-92.]Google Scholar
Strunz, (H.), 1938. Isomorphic zwischen Tilasit, Durangit und Cryphiolith. Centr. Min., pp. 59–60. Google Scholar
Strunz, (H.), 1949. Mineralogische Tabellen. 2nd edit., p. 168. [M.A. 11-2.]Google Scholar
Zachariasen, (W.H.), 1930. The crystal structure of titanite. Zeits. Krist., vol. 73, pp. 7–16. [M.A. 4-281.]Google Scholar