On the Mineralogy and Paragenesis of Tugtupite Na8Al2Be2Si8O24(Cl, S)2.

Authors

  • H. M. Sørensen
  • Ole V. Petersen

Abstract

Tugtupite, Na8Al2Be2Si8O24(Cl, S)2 is colourless to red, tetragonal, pseudocubic and forms triplet twins on {101}. c: a = 1.0269 ± 0.0003, d = 2.33 g/cm3. nε = 1.499 ± 0.001, nω = 1.495 ± 0.001. a0 = 8.637 - 8.643, c0 = 8.867 - 8.870, V0 = 662 Å3. The description of the crystal structure is taken from DANØ (1966) . The mineral occurs in hydrothermal veins in the Ilímaussaq alkaline intrusion, South Greenland, and in the Lovozero alkaline intrusion, Kola Peninsula (beryllosodalite). A number of occurrences of tugtupite in Ilimaussaq are described. Tugtupite is most commonly associated with albite, analcime and Li-mica and is generally secondary after chkalovite. The paragenesis and origin of the mineral and a number of asssociated beryllium silicates are discussed.

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Published

1971-06-30

How to Cite

Sørensen, H. M., & Petersen, O. V. (1971). On the Mineralogy and Paragenesis of Tugtupite Na8Al2Be2Si8O24(Cl, S)2. Meddelelser Om Grønland, 181(13), 57 pp. Retrieved from https://tidsskrift.dk/meddrgroenland/article/view/153142

Issue

Vol. 181 No. 13 (1971): Meddelelser om Grønland

Section

Artikler

License

Coypyright by the authors and the Commision for Scientific Research in Greenland. No parts of the publications may be reproduced in any form without the written permission by the copyright owners.