[HuntsvilleTxVeteran]

I had to look this up.

Quern-stones are a pair of stone tools for hand
grinding a wide variety of materials.
The lower, stationary, stone is called a quern,
whilst the upper, mobile, stone is called a handstone.

[Salamander]

I have a very small ‘complete set’ I found on the ridge above my house.
[since I live in “Indian Springs” I suppose it’s not hard to guess their origins]

I just called them a grindstone and considered them to be a sort of mortar and pestle.
It’s rather small so it may have been for herbs or paints.
The round grinding “ball” is about the size of a tennis ball and the ‘bowl’ is about 10 inches around.

Thanks for telling me what they’re actually called...:)