basalt |
| noun - A hard rock of varied mineral content; volcanic in origin, it makes up much of the Earth's crust.
- A type of unglazed pottery.
| | breccia |
| noun
- Breccia is typically a rock composed of angular fragments in a matrix that may be of a similar or a different material.
| burrstone |
| noun
- A tough, silicify, silicified limestone formerly used to make millstones. It is typified by the presence of multiple cavities that originally housed fossilized shells.
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