Need help identifying. Size is sort of consistent with cat litter. Small gray & inconsistent from tiny gravel, sand, to dust shape. Found behind an electric outlet. The material in question is mostly gray.

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I’m in central Florida if that helps. Just moved in week ago. Hope it’s cat litter, the previous owners did have cats.

​Need help identifying. Size is sort of consistent with cat litter. Small gray & inconsistent from tiny gravel, sand, to dust shape. Found behind an electric outlet. The material in question is mostly gray.