Good rock meshes with welded vertices?

This might seem like an odd question, but I haven’t been able to find any rock meshes with welded vertices - the ones I have are unwelded, and hence cannot be tessellated without “coming apart”. Anyone know of any free meshes that would be usable?

Are they unwelded or are they marked as sharp surfaces? If it’s the latter, you can just smooth them out in blender and use a normal map to preserve the sharper looking aspects of them.

They aren’t usable for tessellation, and the UV mapping is nonstandard, so I need a better set of meshes.

Any free rock meshes in the asset store can be edited - why not just fix them up how you want them?
The verts can be welded in 2 seconds and the UVs can be created in a couple minutes depending upon your choice of unwrap method.

However if you want them to retain a flat shaded poly style (unlikely if you want them tessellated) the meshes will still duplicate or triplicate every vertex upon import, unless using a special shader that ‘makes’ the mesh look flat shaded.