Rating | Solver | Clue |
---|---|---|
LIMESTONE | Hard sedimentary rock | |
OOLITE | Sedimentary rock | |
CHALK | Sedimentary rock | |
SHARE | Sedimentary rock | |
BERYL | Hard rock | |
DIAMOND | Hard rock | |
SHALE | Sedimentary rock | |
SANDSTONE | Sedimentary rock | |
GRANITE | Extremely hard rock | |
QUARTZITE | Hard granular rock | |
STRATUM | Layer of sedimentary rock | |
IRESTONE | Any very hard rock. |