Rating | Solver | Clue |
---|---|---|
OBSIDIAN | Glassy volcanic rock | |
PEARLSTONE | A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produc... | |
IGNEOUS | Volcanic (rock) | |
TUFF | Volcanic rock | |
BASALT | Volcanic rock | |
PUMICE | Porous volcanic rock | |
LAVA | Flowing volcanic rock | |
ANDESITE | Igneous volcanic rock | |
MAGMA | The glassy base of an eruptive rock. |