Abstract
A new mineral - Na4Ba2CeFeNb2Si8O28.5H2O - found in a hydrothermal vein in nepheline-sodalite syenite (naujaite) of the llímaussaq 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; ne = 1.695, no = 1.689. The mineral is hexagonal, ao = 10.80, co = 20.31, Vo = 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.
Highlights
During a visit to the Ilimaussaq alkaline massif, South Greenland, in 1964, a new silicate of rare earth metals, niobium and barium was discovered by E
Ilimaussite was discovered in a hydrothermal ussingite-analcime vein intersecting the poikilitic sodalite syenite of the northern slope of Nåkålåq
In addition to the elements listed in this table the spectrographic analysis
Summary
During a visit to the Ilimaussaq alkaline massif, South Greenland, in 1964, a new silicate of rare earth metals, niobium and barium was discovered by E. The mineral is named ilimaussite after the alkaline massif in which it was first found. The name ilimaussite has been approved by the I.M.A. Commission on New Minerals and Mineral Names. Ilimaussite was discovered in a hydrothermal ussingite-analcime vein intersecting the poikilitic sodalite syenite (naujaite) of the northern slope of Nåkålåq Ilimaussite is a pegmatitic or high temperature hydrothermal mineral. Under supergene conditions it is altered and hydrated, and becomes dull and non-transparent.
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