A mortar imported from the Rhineland

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A mortar imported from the Rhineland

In the Roman period volcanic lava was quarried around the area of Mayen in the central Rhineland. Because it was vesicular (ie, the stone was full of air holes), it was much used for making quern stones and mortars, which needed sharp grinding surfaces. Examples of objects made in these quarries and transported to England are known on many sites in Roman Britain.

Acknowledgments: RAM Museum