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Hibbert's work is illustrated by very carefully drawn and accurate views of some of the old cones and craters of this district, accompanied by detailed descriptions. The lava of Schorenberg, near Rieden, is interesting from the fact, stated by Zirkel, that it contains leucite, nosean, and nephelin. Die Mikros. Beschaf. d. Miner. u. Gesteine, p. 154 . Hibbert, loc. cit., p. 23.
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