. The American encyclopædia of commerce, manufactures, commercial law, and finance. nre plentiftil ond etifily obtained, but In itUnl not i> pnrtlrli; of / exists In a metallic Btate. the QietAl being coiublued with oxygen and other bodies, so that IRON 607 IRON all the properties of the simple substance are eotlrely dis-guised. The richest and mo^t valuable ores of / are oxides,such as the uiaeuetic uxtdes, or umguetite, hematite, red hem-atite, specular /., etc. Ores are rarely us»jd which contain lessthan 25 per cent of /., and they may be roughly divided ac-cordinj; to their richness in
. The American encyclopædia of commerce, manufactures, commercial law, and finance. nre plentiftil ond etifily obtained, but In itUnl not i> pnrtlrli; of / exists In a metallic Btate. the QietAl being coiublued with oxygen and other bodies, so that IRON 607 IRON all the properties of the simple substance are eotlrely dis-guised. The richest and mo^t valuable ores of / are oxides,such as the uiaeuetic uxtdes, or umguetite, hematite, red hem-atite, specular /., etc. Ores are rarely us»jd which contain lessthan 25 per cent of /., and they may be roughly divided ac-cordinj; to their richness into poor ores^ those between 2o and35 per cent; oriiinnry or avera^f ores, between 35 and 50 percent; and rich ores, those containing more than 50 per cent ofmetallic /. In the abundance, purity, and wide distribution of /. ores,and thvir accessibility to the largest coal areas in the world,the C States possesses facilities for an iron industry unexcelledby tho«e of any other laud. Along the eastern coast the mag-netic ores are touud as au almost constant associate of the older. Fig. 289. — BtAST FURXACE. metamorphic rocks, the gneiss, hornblende, and mica pchjetsof the Appalachian Mountains, in nearly continuous lines ofoutcrop from the borders of the St. I^wrence River and LakeChamplain in X. New York, to their terminationc in the of Georgia. The ore occurs in beds interstratified withthe other members of the Archiean system, following thesevere contortions of that series, usually in lenticular-shapeddepositji, and though limited in extent and thickness, arc oftenof great magnitude. The thickness is subject to very greatvariations, and, while sometimes occurring in beds 150 to 200feet thick, they are usually of much less size. In the chantc-ter of the ores, the mode of occurrence, and their associations,they bear a very close resemblance to the magnetic deposits ofSweden. —In N. New York in the Adirondack Mountains, inEssex and Clinton Counties, immense beds are
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