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Sienite. 34* 54 in heighf, of that breadth at top, and 144 at bottom; thewallswcre made of blocks of granite, faftened vvith iron cramps, the chinks itopped vvith mofs, and the fpace betwccn the vvallsfilled vvith granite, fand •, tliis fand, by the oozing of the water impregnated with iron, orother caufes, is now at laft rendered fo hard and compaä: as to prevent any more water from traverfing it, and cannot be diftinguifhed from natural granite. Lafius, Hartz, 91. Granites feem to pafs into fandftone, Lefke, S. 967. Sienite. An aggregate of quartz, hornblende, and fel fpar, orofquaitz, felfpar, hornblende, and mica, appears to ivir. Werner to be of later formation than the nie re aggregate, of which hornblende is not a conftituent q>art; hence he diftinguifhed it at firftby the name of Grtinßen; afterwards, how- ever, he found the name of Sienite more proper, it having been already ufed by Pliny to denote a li- ntilar fubftance; and Chevalier Napion, having difcovered in Sweden a fubftancc which correlb ponds with the grunften of Cronfted, Mr. Wer ner applied this term, as Cronfted had done. Mr. Haequet found fienire fufible into a black glafs in a moderate heat. Crell Beytr. 34. Sienite in aßaty form, has been found in the Altaifchan Mountains; it confilled of fandy quartz, hornblende, and felfpar. Renovanz 5 and 8. The fienite, Lefke S. 1063, is vvorthy of parti- c u!ar attention; its colour'is greenifh; and where Z 3 decompoling