Etched calcite to expose silver from a small ore slab

I cut a small rock with my tile saw and found it contained a little bit of silver. I put the piece into vinegar to dissolve some of the calcite, exposing more silver. If I were to do it again, I would hand-polish the slab (I need to get a flat lap) to remove tiny cut marks from the metal.  Otherwise, I was pleased with the result.  Here is a short video.