Origin of corundum
Examples from the Web for corundum
Copper ore is found in many tracts throughout India, plumbago in Madras, and corundum in southern India.
Corundum is a mineral similar to emery, and corundum wheels are made and used in the same manner as emery wheels.Modern Machine-Shop Practice, Volumes I and II|Joshua Rose
Canadian corundum occurs as a constituent of syenite and nepheline-syenite in Lower Ontario.The Economic Aspect of Geology|C. K. Leith
It is interesting to note that the corundum gems undergo marked change in color under the influence of radium.A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public|Frank Bertram Wade
While Corundum of all colors is used for gems, it is only that which is transparent which can be so employed.