cobalt (kobalt)

[ and at first its value was not known. See ko bold and goblin.] Chemical symbol, Co; atomic weight, 58.8. A metal of a steel-gray color and a specific gravity variously given at from 8.52 to 8.95. It closely resembles nickel, the atomic weights of the two metals being the same, and their specific gravities nearly or quite the same. They have also very nearly the same ductility and tenacity, are almost always found in intimate a ociation, and have in many respects a marked resemblance to iron, but are le fusi ble than that metal, and much le magnetic. Cobalt might be, and is to a very small extent, used for the same purposes for which nickel is used, especially for plating the surface of iron; but it is much rarer than nickel, is procured with more difficulty in the metallic form, and is consequently a dearer metal. The most im portant ores of cobalt are cobaltite, smaltite, and linnæite. (See these words.) Cobalt ores occur in a considerable number of localities, but nowhere in large quantity. The 1. In mining, the operation of breaking ore for the purpose of sorting out the better parts. -2. Broken pieces of old bricks and bottoms of furnaces that have absorbed copper. Encyc. Brit., VI. 348, note. cobblel (kob'l), n. [Also copple ( -stone ); The road is narrow, but deeply cut by long use, and in mer as far north as Cape Cod. cobblery (kobʻlėr-i), n. [ I have myself tried an experiment in a small way in the matter of cobblery . Sir J. Lubbock , Pop. Sci. Mo., XXX. 331. cobblestone (kob'l-stōn), n. [Also copple stone (and coggle stone , q. v.); cobilstone , also (once) cobled stone ; cobble1 + stone .] A cobble or rounded stone; especially, such a stone used in paving. The streets are mostly paved with round cobble -stones. L. Hamilton, Mex. Handbook, p. 109.