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Some CNATs will never get glassy.

Just worry it with some 'flat steel' The deep scratches that you might see that run the length
of the rock are a do not care as long as the bulk of the surface...

These are fun to play with.

Flatten only one side, Write something clever with a waterproof marker on the back.
Perhaps the date and what it is. Just not a grit number.

Find a scrap of mild...