| Answer | Crossword Clue |
|---|---|
| SCHIST | A slaty rock, easily split. |
| SLATE | Easily split rock |
| SHALE | Easily split rock |
| SCHIST | Easily split rock |
| SCHIST | Easily-split variety of rock. |
| argillite | a compact argillaceous rock cemented by silica and having no slaty cleavage |
| phyllite | slaty rock, the cleavage planes of which have a luster imparted by minute scales of mica |
