Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Rock Cliff Free.
Rock Cliff v2.0
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Features:
This is a photo real rock surface that could also be rearranged in many ways, for example by duplicating the geometry and modifying it, adding deformers like “bend” or braking it down to several smaller elements and rearrange them in different ways.
Usage:
This geometry is meant to be used with a self illuminated shader also known as a “surface shader” or an “unlit shader” regardless if its used for films or games. Ideally you should choose the right balance of how much the geometry is being affected by lights in the scene.