in the form of fine gems. It having been suggested that this material
would cut and polish a diamond, an experiment was made on a new wheel
in the mining building at the World's Columbian Exposition. After
several trials it was found that the carborundum used would not scratch
or polish the diamond, but on the other hana it was easily scratched by
diamond cleavages and crystal faces.
experiment is only mentioned as it precludes any possibility of the
material which has been found in the Canyon Diablo meteorite being any
compound of carbon and silicon, such as the new interesting and
valuable abrasive material just mentioned. But it establishes the fact
that we have here an artificial substance that exceeds all natural
sab-stances except the diamond in hardness, i. e., being harder than 9, but still far distant from 10.