| Answer | Crossword Clue |
|---|---|
| sylvinite | a rock composed of sylvine and rock salt |
| sylvinites | SYLVINITE, a rock composed of sylvine and rock salt |
| brecciate | of a rock, composed of angular fragments / to break a rock down into angular fragments |
| rupestrian | composed of rock; inscribed on rock |
| evaporite | any sedimentary rock, as gypsum or rock salt, formed by precipitation from evaporating seawater |
