Siliceous rock often occurring as flint nodules in chalk
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Related clues
- Variety of silica that contains microcrystalline quartz
- A microcrystalline form of silica also called hornstone
- Rock of which flint is a variety
- Hard microcrystalline or cryptocrystalline form of silica resembling, and sometimes synonymous with, flint
- Microcrystalline form of silica whose varieties include jasper, flint, lyddite etc.
Possible answers
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- H
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- R
- T