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Diamond Manufacture and Diamonds inMeteoric Iron.—Mons. Henri Moissan haB recently contributed some interesting papers to the Paris Acad^raie des Sciences with reference to the manufac-iture of the diamond. The author refers the varieties of carbon to three chief types : diamond, graphite, and amorphous carbon, and he lays before the Academy an account of the preparation of carbons of a high specific gravity. As a preliminary he has studied the composition of the asn of the diamond, of bort, ana of carbonado. He shows the existence of graphite, of carbonado, and of microscopic diamonds in the blue J earth of South Africa, and the existence of the diamond in the meteorite of Canon Diablo. He has studied the solubility of carbon in magnesium, aluminium, man ganese, chrome, uranium, silver, platinum, and silicon. Operatiug on a mixture of diamond, graphite, and amorphous carbon he has removed all matter except diamond by successive treatment with hydrochloric or nitric acid, boiling sulphuric acid, hydrofluoric acid, and a mixture of potassium chlorate with nitric acid. He succeeds by these means in separating from the blue earth a variety of carbon hard enough to scratch ruby, and of the specific gravity of diamond. In burns in oxygen, yielding 3—3 5 carbonic acid. Regarding the Canon Diablo meteorite, Mons. Henri Moissan says that the composition of the meteorite is very variable from point to point. In the fragments examined the percentage of iron varied from 91-09 to 95-06, and that of nickel from 1-08 to 7‘05. Diamonds were also found, both transparent and black, and a brown form of carbon of feeble density. The largest diamond measured 0-7 mm. by0-3 mm. It had a yellow tint and a rough surface, and was transparent to light. Respecting the same subject, Mons. Friedel observed that a small quantity of a silver-white fragile compound occurring in the meteorite in the form of plates disseminated through the nickeliferous iron and
Newspaper Details
Iron
London, Middlesex, GB
Fri, Mar 03, 1893
Page 10
Full Page
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USA 01 Apr 2022
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