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Related Clues:
- Sedimentary clay rock, which may contain oil
- Crystalline rock
- Rock often containing quartz
- Oil-rich mineral
- Fossil holder
- Kerosene source
- Barman gets his tea by rock in Wicklow mountains
- Fissile rock
- Fracking rock
- Rock used for flagstones
- Thin-layered rock
- Flaky metamorphic rock
- __ oil
- Clayey rock
- Soft sedimentary rock