Cortusa

( Bot.) A genus of plants, order Primula cese. The well-known Bear's-ear Panicle. C. Mathioli is one of the finest species. Corun'na, in Indiana , a post-village of DeKalb co. Corunna, in Michigan , a city, cap. of Shiawa ee co., $5 m. N.W. of Detroit. Pop . (1897) about 2,000. Corundum, n. [Hind.] ( Min .) The Adamantine spar , a crystallized or ma ive mineral, composed of nearly pure anhydrous alumina. It is the hardest of all known substances, except the diamond, on which account it is much used for polishing steel and cutting gems. The term C., or Common C., is generally confined to the opaque rough crystals and cleavable ma es, generally of dingy colors and often dark; while the term Emery embraces the more or le impure, ma ive, granular, and compact kinds, and Precious Corundum the transparent, brightly tinted varieties which are used as gems; the blue variety under the name of Sapphire , the red of Ruby , the yellow of Oriental Topaz , and the violet of Oriental Amethyst. The crystals which show a bright opalescent six-sided star in the direction of the vertical axis, are called Asteria or Star-stones. Corun'na, a sea-port of Spain, cap. of a prov. of the same name, in Galicia, on a peninsula at the entrance of the Bay of Betanzos, 30 m. E. of Lagos; Lat. 43° 22′ N., Lon. 8° 22′ W. The harbor is spacious and secure. Manuf . Cordage, linen goods, . It was twice taken by the French, in 1809 and 1823. Pop . 31,216.