I created material, using texture (like granite), shader - unlit/texture. When applied to object such material looks clean - as usual material, no grain at all.
What object are you applying the material to?
Does it have a proper uv map?
It’s happens with any object imported from Blender, with Unity’s objects it’s ok. How to know about UV map ?
There are a lot of blender UV mapping tutorials out there.
https://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro/UV_Map_Basics
Thanks. I should’ve been put textures of objects using UV mapping in Blender.