| Rating | Solver | Clue |
|---|---|---|
| CALCITE | Limestone mineral | |
| WARWICKITE | A dark brown or black mineral, occurring in prismatic crystals imbedded in limestone near Warwick, New York. It consists of the borate and titanate of magnesia and iron. | |
| DOLOMITE | ... magnesia in varying proportions. It occurs in distinct crystals, and in extensive beds as a compact limestone, often crystalline granular, e... |