Does anyone remember fried marbles? I think that we did that in the late sixties or early seventies.

We’d place the mables in a fry pan and heat them for several minutes; then plunge them into ice cold water to cause them form internal cracks.

They would look like tiny kalaidoscopes.
We could then drill holes through them so that we could string them up for jewelry.

We sure did ruin a lot of great puries that way.