55 13] Reduction spheroids from northern Switzerland" Mineralogy, geochemistry and genetic models...ineralogisch-petrographisches Institut, CH-3012 Bern (Switzerland) (Received May 4, 1989; accepted for publication...A., 1990. Reduction spheroids from northern Switzerland: Mineralogy, geochemistry and genetic models...red-beds and from crystalline rocks of northern Switzerland have been studied mineralogically and geochemically...lamprophyre, gneiss and granite in northern Switzerland (Hofmann, 1986; this paper ); altered felsic |