Myrmekite-like intergrowths in larvikite feldspars |
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| Affiliation: | 1. Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari, via E. Orabona 4, I-70125 Bari, Italy;2. Department of Geology, University of Tromsø, N-9037 Tromsø, Norway;3. Norwegian Mining Museum, PO Box 18, N-3602 Kongsberg, Norway;4. Geological Institute, Kola Scientific Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity 184209, Russia;5. Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N-0316 Oslo, Norway;1. Dpto. Geología y Geoquímica, Universidad Autónoma, Campus de Cantoblanco, 28049, Madrid, Spain;2. Dpto. Cristalografía Mineralogía y Q. Agrícola, Universidad de Sevilla, c/ Professor García González 1, 41012 Seville, Spain |
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| Abstract: | Electron microprobe analyses of feldspars and nepheline from a number of larvikite specimens are presented. Nepheline occurs as primary grains, as vermicular grains in mrrmekite-like intergrowths with potash feldspar, as small blebs in potash feldspar lamellae and as larger grains surrounded by irregular, K-rich feldspar domains. It is believed that the different forms of nepheline associated with potash feldspar are formed by exsolution in the solid state. |
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