| LENTICLE | A piece of rock that is convex on both sides |
| LENTIFORM | Having a shape that is convex on both sides (9) |
| MENISCUS | Lens that is convex on one side and concave on the other |
| SEDIMENTARY | Type of rock that is neither metamorphic nor igneous |
| KIESERITE | Mineral in last bit of rock that is found at location containing erbium |
| ASTEROID | Piece of rock that may fall from the heavens (8) |
| STONEFISH | Venomous tropical marine fish that resembles a piece of rock on the seabed (9) |
| CORE | Word for the very "heart" of something, from apple, medlar and pear to planet Earth or a piece of rock from its terre (4) |
| THRESH | Word, from "beat seeds out of corn/grain", for a chastising flog with a whip, a fast race, a flail or writhe about, a lavish noisy party, a loud piece of rock music or a severe trounce (6) |
| NEIL | Spaceman and alien return before crazy storm carrying a piece of rock? No good! (4,9) |
| ARMSTRONG | Spaceman and alien return before crazy storm carrying a piece of rock? No good! (4,9) |
| COAL | Found underground: ___ is a black rock that is mined to make electricity |
| PERIDOTITE | Olivine-rich rock that is a major component of Earth's mantle (10) |
| BASALT | Igneous rock that is the commonest type of solidified lava (6) |
| BAUXITIC | Describing the clay-like rock that is the main ore of aluminium (8) |
| LOSS | Result of throwing scissors (if your opponent throws rock, that is) |
| IGNEOUS | A type of rock that forms when volcanic magma cools and solidifies (7) |
| DORSAL | A crucian carp's ___ fin is convex (6) |
| LORELEI | Legendary rock that is let roll, for the most part in both cases all the way back (7) |
| LAPISLAZULI | Deep-blue metamorphic rock that is the only natural source of the pigment ultramarine (5,6) |
