$2 dirt rock pile Low-poly 3D model by ultra3dmodels. Available on CGTrader. Check it out on CGHub.
STL (Stereolithography, filesize: 6.6 MB), OBJ (OBJ, filesize: 7.32 MB), C4D (Cinema 4D, filesize: 4.3 MB), FBX (Autodesk FBX, filesize: 18 MB), BLEND (Blender, filesize: 67.9 MB), JPG (JPG, filesize: 61 MB)