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2 /6 Siliceous Genus. porofity 0 f its enamel. Hence Mr. Werner iuflly coniiders it as a particular fpecies, but nearly allied to zeolite. 19th Species. iEdelite, or Siliceous Zeolite Its colour is lightgrey, fometimes with a tinge o red > or yellowilh brown, green, or yellowilb green. Its luftre, o.i. Its form, tuberofe, or knotty. Its fradlure, ftr:ated, but fometimes fplinterv like quartz. Its hardnefs from 9 to 10. Sp. g r . 2 ti- when penetrated with water, of which thefe (iones abforb about T L. of their weight, and fometimes more. _ The extcrnal charaders are but imperfcdly given, as I neither poffefs any fpecimen, nor have leen any jufl defcription of it. _ Treated by the blowpipe it intumcfces, and gtves a frothy mafs. It contains from 0,62 to 0,69 filex, o,t8 or 0,20 argill, 0,08 or 0,16 calx, and 0,03 or 0,04 of water. Per ßergman, Mem. Stock. 1784, p. 114' Thefe flones have hitherto been found only in Sweden, at Adelfors, and Meffeberg, and muft not be confounded with zeolites mixed with lilex or calcfcdony, which are much more common, * Schwed Abhandl. 1784, p. 114. and