| Answer | Crossword Clue |
|---|---|
| plumbagos | PLUMBAGO, graphite (a soft variety of carbon) |
| graphites | GRAPHITE, a soft variety of carbon |
| plumbago | graphite (a soft variety of carbon) |
| plumbago | very common mineral, soft native carbon, occurring in black to dark-gray foliated masses, with metallic luster and greasy feel: used for pencil leads, as a lubricant, and for making crucibles and other refractories; plumbago; black lead |
| graphite | a soft variety of carbon |
