Little bit but try not to get such a close shot I can enlarge your pic if needed to. I find a shot about a foot away will produce clearer than if I try to get a close up. Practice makes perfect. Keep trying also maybe try cleaning the camera eye I know you are using your phone. They get dirty sometimes.
I love the color! Do you know the material type? It looks similar to a chunk of chert we had in a ring of stones around our fire pit. I guess we inadvertently heat treated it. The inside was almost the color of your find, but kind of chalky looking.