Volltext Seite (XML)
208 IRON. constituent rarts. Dodecahedral Pyrites in striated Py rite3 in smooth Pyrites. Cubes. Sulphur, 52.15 52.50 Iron, 47.85 47 50 100 ioo Hatchett, Phil. Trans for 1804. Cubes. 52.70 47.30 100 Some varieties, particularly those in striated cubes and dodecahedrons, contain a portion of gold, and hence have been named Auriferous Pyrites: other varieties contain silver. ucognosiic Situation. It occurs in beds, in primitive, transition, and fleet?! mountains; also disseminated through various rocks, as granite, gneiss, rinca-slate, clay-slate, primitive greenstone, porphyry grey-wacke, sandstone, slate-clay, limestone, • , Veins in I ,r imitive mountains, it is associated with galena or lead-glance, copper-pyrites, arsenical-py- r ’ Wende, frequently with native gold, seldomer with ores of silver: in transition mountains, with galena or lead-glance, blende, copper-pyrites, sparry ironstone, cal careous and fluor spar ; and in fleet* rocks, with ores of lead, copper, and zinc, and quartz, calcareous-spar, and iluor-spar. It is worthy Of remark, that quartz is one of the most constant attendants of common iron-pyrites. Geographic Situation. This mineral is so universally distributed, that it is not necessary to enter here into any geographical details in regard to it. Use.