| Rating | Solver | Clue |
|---|---|---|
| SHALE | Soft rock | |
| TALCUM | Soft rock | |
| SANDSTONE | Soft rock | |
| WACKY | A soft, earthy, dark-colored rock or clay derived from the alteration of basalt. | |
| MOLASSE | A soft Tertiary sandstone; -- applied to a rock occurring in Switzerland. See Chart of Geology. | |
| SAPONITE | A hydrous silicate of magnesia and alumina. It occurs in soft, soapy, amorphous masses, filling veins in serpentine and cavities in trap rock. | |