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Siliceous Spar. 3 a 9 44th Species. Siliceous Spar. Säulen Spath of Bindheim. Its colour, white, ftraw yellow, or fea green, mountain green, or light blue. Red ? Its luftre filky, 2. It is found cryftallized in quadrangular or hexangular prifms, tranfverfely ftreaked, and generally heaped together. • Its frafture fibrous, or ftriated. It effervefces with acids. According to the analyfis of Mr. Bindheim, it contains 61,1 filex, 21,7 calx, 6,6argill, 5 mag- neüa, 1,3 calxofiron, and 3,3 water. 3 Schrift. Naturforch. Freunde, p. 452. The defcription above given is imperfeft; yet from that, and the analyfis, we may infer that it is nearly allied to zeolites. Mr. Bergman in- deed * confiders it as of the fame fpecies as the zeolite of Haelleftadt; but the fmall proportion of water it holds difcriminates it too ftrongly from that foffil to allow them to be of the fame fpecies. Mr. Hoffman, on the contrary, conjeftures it naay be the fame as the tremolite of Hcepfner, which Mr. Ferber -f~ informs us is of a red co lour, and fibrous, or ftriated, and 111 which Mr. Klaproth found 0,65 filex, 0,18 calx, 0,103 * Schwed. Abhand. 1784.. t Drey Briefe Miner. Inhalt, p. 21.