| NOUN | substance | hornstone, hornfels | a fine-grained metamorphic rock formed by the action of heat on clay rocks |
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| Meaning | A fine-grained metamorphic rock formed by the action of heat on clay rocks. | |
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| Synonym | hornfels | |
| Broader | metamorphic rock | rock altered by pressure / pressure and heat / heat |
| Spanish | corneana, hornfels | |
| Catalan | cornubianita, hornfels | |
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