Related Clues:
- Hard crystalline metamorphic rock
- Hard crystalline limestone, can be polished
- Hard crystalline limestone
- Hard crystalline rock
- Hard, crystalline rock
- Small ball of glass used in game
- Crystalline limestone often used in sculpture
- Small ball with hole through the middle
- Hard, crystalline, metamorphic rock
- Crystalline limestone often used by sculptors
- Hard shiny stone used by sculptors
- Type of rock
- Hard limestone that takes a high polish
- Small ball with a hole through the middle
- 'Hard, crystalline rock (6)'