how to change the texture of the material from polished to natural chipped I have a picture of polished granite. I want to transform that material so that it looks like natural chipped as attached below. first of all is it possible if so how?
1) I tried creating a normal map of natural chipped but my reference image is very small so I cant use it on the larger surface without tiling 
2) how do I transform the polished granite to look like a rough granite, I have no idea on how to approach this
You could do it procedurally:

Use 2 Noise nodes that you mix into a MixRGB (Overlay mode) node. Then you can add some glossiness or bumpiness, it all depends on the realism you want to give to your material...