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CO PPER.-PY RITES. 117 Chemical Characters. Before tlie blowpipe, on charcoal, it decrepitates, emits a greenish-coloured sulphureous smoke, and melts into a black globule, which, by continuing the fire gradually, assumes the metallic lustre of copper. It imparts to borax a green tinge. Constituent Parts. Cornwall. Sainbel, Copper, - - 30 30.0 Iron, - - 53 31.0 Sulphur, - ^ 12 36.5 95 07.5 Chenevix. Guenkeau. It sometimes also contains small portions of gold or silver. . Gcognostic Situation. It is one of the most abundant ores: it occurs in al most every kind of repository, and in all the great classes of rocks. Thus, it is met with in granite, gneiss, mica- slate, clay-slate, porphyry, syenite, trap, grey-wacke, in the first floetz limestone, in coal formations, and also in in those of sandstone. In these rocks, if is associated with various metalliferous and earthy minerals, such as iron-pyritcs, magnetic ironstone, malachite, azure cop- per-ore, tile-ore, red copper-ore, variegated copper-ore, copper-glance or vitreous copper-ore, galena or lead- glance, blende, cobalt-ochre, arsenical-pyrites, sparry ironstone, and sometimes native gold : the earthy mine rals are calcareous-spar, fluor-spar, heavy-spar, brown- 11 3 s P ar >