I’ve been practicing photo scanning rocks and made a collection that I thought I would give away for free. Includes 4k PBR Color, Normal and Roughness maps.
Most of the models were brought down from around 20 million verts. All models are seamless and watertight. The normal maps were made from mixing the high poly bake and a normal map made from the color texture. I hope you all enjoy. https://drive.google.com/open?id=1SWfNfamtGbGWZ1TNnJyYmy4t-OhBPAcl
Check out some more free photoscans I have on Sketchfab.