Original model by "3DMaesen", found on Sketchfab.com:
https://sketchfab.com/3d-models/rocks-set-4-e7af5af7ce56449e879434cf5ec3a84d

Licensed under CC-BY 4.0:
https://creativecommons.org/licenses/by/4.0/

Textures "skin*.png" and "skin_n*.png" edited by "RaZgRiZ" to better match the engine requirements.
Additional texture "mask.png" created by "RaZgRiZ" for the same reason.