 | | Journal (article/letter/editorial) | | pegmatites from Sveconorwegian terranes in southwestern Sweden Rolf L. R o m e r a'b, S t e n - A n d e r s S...Applied Geology, Luled University, S-971 87 Luled, Sweden Clnstitute of Earth Sciences, MineraL-Petrol.,... Norbyvi~gen 18B, S-752 36 Uppsala, Sweden Received 20 December 1994; revised versionaccepted 23 May...in the Sveconorwegian Province of southwestern Sweden yield U-Pb columbite ages at 1041.4 + 1.6 Ma (2o-)...with earlier U-Pb data from southern Norway and Sweden define a zonal pattern with increasingly younger |  | | Book | | paragenesis: amazonite associates with albite, topaz, beryl, fluorite, tourmaline, micas, and a wide...commonly considered amazonite a sure sign for finding topaz (known in Russian as a heavyweight): “Extensive...‘heavyweight’ (there are mines with amazonite but without topaz, but the reverse correlation had apparently never...close connection was noted between amazonite and topaz, along with rare black minerals (columbite, fergusonite)...and characteristics of the internal texture of topaz-amazonite veins, noting in particular that in the |
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