Sentence Examples with the word carbonado

It is almost exclusively in the mines of Bahia, and in particular in the Cincora district, that the valuable carbonado is found.

For rock drills, and revolving saws for stone cutting, either diamond, bort or carbonado is employed, set in steel tubes, disks or bands.

Both bort and carbonado seem to be really aggregates of crystallized diamond, but the carbonado is so nearly structureless that it was till recently regarded as an amorphous modification of carbon.

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The carbonado and the diamond have been traced to an extensive hard conglomerate which occurs in the middle of the sandstone formation.