| Answer | Crossword Clue |
|---|---|
| chalcocites | Cuprous sulfide, an ore of copper, usu. occurring as black, fine-grained masses |
| chalcocite | Cuprous sulfide, an ore of copper, usu. occurring as black, fine-grained masses |
| cuprites | mineral, cuprous oxide, Cu2O, occurring in red crystals and brown to black granular masses: an ore of copper |
| cuprite | mineral, cuprous oxide, Cu2O, occurring in red crystals and brown to black granular masses: an ore of copper |
