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Ch. 8: Other Stones Used in Jewelry

Ch. 8: Other Stones Used in Jewelry Page of 295 Ch. 8: Other Stones Used in Jewelry Text size:minus plus Restore normal size   Mail page  Print this page
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Malachite.
MALACHITE.
This beautiful copper ore, in such great demand for ornamental purposes, is a hydrous carbonate of copper, and, apart from its value as a stone, yields so large an amount of metal that it is extensively used for smelting. According to Klaproth, its analysis is—
In a glass tube before the blowpipe it blackens, and yields a globule of copper; in acids and ammonia it dissolves with effervescence. Its hardness is 3.5; spe­cific gravity 3*7 ; lustre vitreous, sometimes nearly ada­mantine, occasionally silky, and often dull ; colour green, spotted and banded with other shades of the same co­lour ; it takes a very high polish. Out of the thousands of tons annually found, a very small proportion is ad­apted for ornamental purposes, the compact variety sus­ceptible of a high polish being very rare. The finest quality comes from the mines of Prince Demidoff, in Siberia. The doors and vases of malachite exhibited by the Prince in the Exhibition of 1851 created a great sensation, and first drew public attention to the sub­stance. It is also found in the Burra-Burra mines in Australia, in Africa, Cornwall, Hungary, and the Tyrol ; but all these varieties are far inferior in solidity and beauty of marking to Siberian malachite. This stone is some-
Ch. 8: Other Stones Used in Jewelry Page of 295 Ch. 8: Other Stones Used in Jewelry
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