Polishing media?

Obsessive

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Tesoro Cibola / Land and Sea pinpointer
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Ever seen anything like this?

I was up off a road side trail head in LNF when I found these.

At first I thought it was some kind of animal feed, or scat. Then I saw more and more, a pile of it covering the ground.

They seem to be made of a pumice type material.

Any thoughts on what this stuff might actually be? I was thinking some kind of polishing media or perhaps an anti-erosion ground cover?

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