1.  Ilímaussite, a new rare Earth-Niobium-Barium Silicate from Ilímuassaq, South Greenland.

E. I. Semenov; M. E. Kazakova; V. J. Bukin

1. Ilímaussite, a new rare Earth-Niobium-Barium Silicate from Ilímuassaq, South Greenland.

Authors

E. I. Semenov
M. E. Kazakova
V. J. Bukin

Abstract

A new mineral – Na₄Ba₂CeFeNb₂Si₈O₂₈.5H₂O - found in a hydrothermal vein in nepheline-sodalite syenite (naujaite) of the Ilímaussaq alkaline massif is described. The mineral is named ilimaussite after the locality where it was found. It forms brownish-yellow lamellae and is associated with ussingite, chkalovite and epistolite. The specific gravity is 3.6. The mineral is optically uniaxial positive; n_e = 1.695, n₀ = 1.689. The mineral is hexagonal, a_o = 10.80, c_o = 20.31, V_o = 2052 Å³, Z = 3. The chemical composition is : SiO₂ - 31.28, TiO₂ - 1.64, Nb₂O₅ - 13.20, TR₂O₃ - 10.60, Fe₂O₃ - 3.18, BaO - 23.62, Na₂O - 7.00, K₂O - 3.80, loss by ignition - 6.43 ; total 100.75.

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Published

1968-06-13

How to Cite

Semenov, E. I., Kazakova, M. E., & Bukin, V. J. (1968). 1. Ilímaussite, a new rare Earth-Niobium-Barium Silicate from Ilímuassaq, South Greenland. Meddelelser Om Grønland, 181(7), 1–8. Retrieved from https://tidsskrift.dk/meddrgroenland/article/view/153074

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Issue

Vol. 181 No. 7 (1968): 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.