A microcrystalline form of silica also called hornstone |
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Silica rock |
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Hard microcrystalline or cryptocrystalline form of silica resembling, and sometimes synonymous with, flint (5) |
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Rock of which flint is a variety |
The Times Specialist |
18 Nov 2024 |
Quartz rock |
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Variety of silica that contains microcrystalline quartz |
The Telegraph General Knowledge |
15 Mar 2021 |
Siliceous rock often occurring as flint nodules in chalk |
The Guardian Speedy |
23 Aug 2020 |
Rock with that lady in Connecticut |
The Telegraph Toughie |
27 Sep 2019 |
Event that's sure to include hard rock |
The Times Cryptic |
26 Jun 2015 |
Rock like flint |
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Fine-grained silica |
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Rock found in limestone beds |
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Flintlock rock |
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Flintlike rock |
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Quartz |
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Fine-grained rock |
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Flint-like rock. |
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Dull-colored flintlike quartz. |
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Flintlike quartz. |
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Kind of quartz. |
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