| Answer | Crossword Clue |
|---|---|
| diabase | fine-grained gabbro occurring as minor intrusions |
| diabases | fine-grained gabbro occurring as minor intrusions |
| diabasic | fine-grained gabbro occurring as minor intrusions |
| 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 |
| apatite | any of a group of calcium phosphate minerals occurring in various colors as hexagonal crystals, as granular masses, or in fine-grained masses as the chief constituent of phosphate rock and of bones and teeth |
