carbonado

/kahr-buh-ney-doh/US // ˌkɑr bəˈneɪ doʊ //UK // (ˌkɑːbəˈneɪdəʊ, -ˈnɑːdəʊ) //

碳酸盐,炭化,碳化,炭化炉

Definitions

n.名词 noun

1
plural car·bo·na·dos, car·bo·na·does.
- : a massive, black variety of diamond, found chiefly near São Salvador, Brazil, and formerly used for drilling and other cutting purposes.

And then added with a grim smile, "But we'll see if an Englishman will not make as good a carbonado as a Portuguese!"
Ilmenite has sometimes been mistaken in the South African mines for carbonado.
The largest piece of carbonado ever recorded was found in Bahia in 1895, and weighed 3150 carats.
Extensive mines are worked at Carbonado, and test shafts have been opened at a few localities near the trail which we followed.
It is almost exclusively in the mines of Bahia, and in particular in the Cincora district, that the valuable carbonado is found.