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. 1897 Excerpt: ...of chisels having been destroyed in the process. When the mass, which on the exterior was not distinguished from other pieces of meteoric iron, was divided, it was found that the cutting apparatus had fortunately gone through a cavity. In the attempt to polish the surface so as to bring out the characteristic ...
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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. 1897 Excerpt: ...of chisels having been destroyed in the process. When the mass, which on the exterior was not distinguished from other pieces of meteoric iron, was divided, it was found that the cutting apparatus had fortunately gone through a cavity. In the attempt to polish the surface so as to bring out the characteristic Widmannstatten figures, Dr. Krenig received word that the emery wheel in use had been ruined. "On examination, he then found that the exposed cavities contained Diamonds which cut through polished Corundum as easily as a knife will cut through Gypsum. The Diamonds exposed were small, black, and, of course, of but little commercial value, but, mineralogically, they are of the greatest interest, the presence of such in meteorites having been unknown until 1887, when two Russian mineralogists discovered traces of Diamonds in a meteoric mixture of olivine and bronzite. Granules of amorphous carbon were also found in the cavity, and a small quantity of this treated with acid had revealed a minute white diamond of one-half a millimeter, or about nfo of an inch in diameter. In manipulation, unfortunately, this specimen was lost, but others will doubtless be obtained in the course of invest gation. The minerals Troilite and Daubreelite were also found in the cavities. The proportion of nickel in the general mass is three per cent., and the speaker was not as yet able to account for the extraordinary hardness apart from the presence of the Diamonds in the cavities." The interesting character of the iron led other eminent chemists and high authorities on meteorites, to investigate it, all of whom have proved the presence of Diamonds, irregularly disseminated throughout different specimens examined. No Diamonds of any commercial value have been found; t...
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