Related Clues:
- Rock formed by lava
- Most common volcanic rock
- Inky color
- 90% of Earth's volcanic rock
- Just by lake has left stone
- Semiprecious stone with bands of color
- Order New York Times from The Gem
- Black-and-white gem
- Rock with colorful bands
- Stone used for cameos
- Dark gem
- Black gemstone, perhaps
- Stone bull seen around New York
- Stone sailor found under boat, oddly
- Gem with alternating black and white bands