It is a small stone with deposits of quartz inside
Model size are 17x20x23 cm.

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The formats included are:

.BLEND - Blender 2.80 with EEVEE materials (include textures)

.OBJ (0, 1, 2 smooth levels)

.FBX (0, 1, 2 smooth levels)

.STL (0, 1, 2 smooth levels)

In 1&2 levels applied displacement modifier and model quality are better. In Blender this modifire is on.
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Without smooth modifier - 4.446 tris
1st level of smooth - 17.784 tris
2nd level of smooth - 71.136 tris
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Textures 2048*2048 (in textures.zip):

rock_diffuse.png
rock_normal.png
rock_roughness.png
rock_specular.png
rock_AO.png

and simple HDRI map Road_Valley.hdr