Nigerite from the Rosendal pegmatite and aplites, Kemiö island, southwestern Finland | Zendy

E. A. J. Burke | Zendy; P. Lof | Zendy; H.P. Hazebroek | Zendy

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Nigerite from the Rosendal pegmatite and aplites, Kemiö island, southwestern Finland

Author(s) -

E. A. J. Burke,

P. Lof,

H.P. Hazebroek

Publication year - 1977

Publication title -

bulletin of the geological society of finland

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.4

H-Index - 24

eISSN - 1799-4632

pISSN - 0367-5211

DOI - 10.17741/bgsf/49.2.008

Subject(s) - pegmatite , tourmaline , geology , cassiterite , muscovite , geochemistry , corundum , spinel , staurolite , sillimanite , plagioclase , columbite , mineralogy , greisen , andalusite , quartz , metamorphic rock , tin , kyanite , materials science , biotite , metallurgy , fluid inclusions , paleontology , ceramic

Nigerite occurs as small hexagonal platy crystals in the Rosendal pegmatite and in associated aplitic veins on Kemio island, southwestern Finland. This is the first reported occurrence of nigerite in the Baltic Shield. Associated minerals are quartz, hercynite or gahnite spinel, plagioclase, muscovite, sillimanite, garnet, columbitetantalite, chrysoberyl, tourmaline, apatite, corundum, Zn-bearing staurolite, and cassiterite. Nigerite has been formed under conditions of oversaturation of Al by desilicification of the pegmatite system. Microprobe analyses of the Rosendal nigerite were calculated by a general formula: R~~2xSnxR~+ OS, with R2+ = Zn, Fe2+, Mg, Mn, and Ca, R3+ = AI, Fe3+, Nb, Si, and Ti, and x = around 0.5. The Fe/Zn ratio of the different nigerite crystals is controlled by the initial composition of the associated spinel.

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