Sorensenite, a new Sodium-Beryllium-Tin-Silicate from the Ilímaussaq Intrusion, South Greenland.

Authors

  • E. I. Semenov
  • V. I. Gerassimovsky
  • N. V. Maksimova
  • S. Andersen
  • O. V, Petersen

Abstract

The new mineral sorensenite (Na4SnBe2Si6O16(OH)4 ) occurs in groups of prisms attaining diameters of several centimetres. The mineral is transparent or semitransparent, colourless, brown or pink. The crystals are monoclinic, a0 = 18.58, b0 = 7.45 and c0 = 12.05, β = 98°09'. Space group - 12/a, - I a.

There are two distinct cleavages. The specific gravity is 2.9, the hardness 5-5.5. The mineral sometimes forms flat pseudohexagonal triplets with the normal to ( 011) in (100) as twin axes. The mineral is biaxial negative, 2 Vα= small to 75°, nα = 1.576-1.579, nβ = 1.581- 1.585 and nγ = 1.584-1.586.

The chemical analysis (by M. E. KAZAKOVA): SiO2 49.73, SnO2 20.07, Nb2O5 0.75, Fe2O3 0.04, BeO 8.02, Na2O 15.95, K2O 0.34, H2O 5.24; total 100.14 corresponds to the formula: Na4SnBe2Si6O16(OH)4. The mineral occurs in analcime-rich bodies in nepheline-sodalite-syenites of the Ilímaussaq massif, South Greenland. It is abundant in a few localities. Sorensenite is named after professor HENNING SØRENSEN, Copenhagen, who directs the investigations in the Ilímaussaq region.

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Published

1965-11-30

How to Cite

Semenov, E. I., Gerassimovsky, V. I., Maksimova, N. V., Andersen, S., & Petersen, O. V. (1965). Sorensenite, a new Sodium-Beryllium-Tin-Silicate from the Ilímaussaq Intrusion, South Greenland. Meddelelser Om Grønland, 181(1), 23 pp. Retrieved from https://tidsskrift.dk/meddrgroenland/article/view/153058

Issue

Vol. 181 No. 1 (1965): 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.