Metal-work; a handbook for teachers and students (1914)
Adam, Hugh M. [from old catalog], Evans, James Humphrey, [from old catalog] joint author · New York, Longmans, Green and co.; London, E. Arnold · leaf 26
omevein or bed, and which have become filled with mineralmatter. Fig. 1 shows the various formations. OCCURRENCE OF METALS 9 Forms of Ore—Iron.—Iron in a native form occurs inminute quantities only, the most important ores being theoxidized minerals. The common ores of iron are— 1. Bed Hcematite… … Fig. 1.—OccTJKEENCE OF Ores. hard surface. It is fairly hard, and sometimes occurs in roundlumps with a radial structure, when it is termed kidneyore. It often contains 70 per cent, of pure iron, and, beingremarkably free from sulphur, phosphorus, and other im-purities, has a great value for…
Metal-work
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