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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...of this mineral (cuprite) have the composition Cu20. It is found in Cornwall, but the quantity is small compared with that of the sulphide ores. Black oxide of copper (CuO) is also found in slight amount. Carbonates of Copper, containing various proportions of oopper hydroxide and copper carbonate, are found as malachite, CuC03.Cu(OH)2, and blue malachite or azurite, 2CuC03.Cu(OH)2. The most noteworthy deposits of these minerals are those at Burra-Burra in Australia. Copper Pyrites.--This is one of the most abundant of copper ores. Pure specimens have the composition Cu2S.Fe2S3, but the ores which are worked contain a certain amount of gangue and generally an excess of sulphide of iron, and are frequently associated with arsenic. Indeed, iron pyrites containing copper (see Manufacture of Vitriol, Vol. II.), is worked for the copper which it contains. A variety richer in cuprous sulphide than is ordinary copper pyrites, corresponding with the formula 3Cu2S.Fe2S3, is known as peacock copper from its variegated colours. Copper Glance.--This ore corresponds with the formula Cu2S (cuprous sulphide). It is found in Cornwall, and occurs in Siberia, Saxony, and elsewhere. Grey Copper Ore consists of copper sulphide associated with antimony sulphide, its composition being very various. Cupriferous Schists, consisting of bituminous shale through which copper pyrites and copper glance are disseminated, occur at Mansfeld. WINNING OF COPPER FROM ITS ORES. A. DRY PROCESSES.--The following general principles may be said to control the dry processes for the extraction of copper:--The production of copper from its ores differs essentially from that of iron by reason of the fact that the chief ores worked contain copper as sulphide instead of as oxide, and that sulphur, inst...
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