
Now, while searching for something else, I found this picture:

This is it, isn't it? It has a unique shape, looks like coal and has features that go well into a normal map

I created most of the other textures by creating a few rocks and shapes and putting them together like a puzzle - this approach won't give good results here, I think, seeing how comparatively tidy and well-structured the surface is (cracks are ~ parallel, lines in the material itself are parallel, flat surface). Can we use this photo in the texture? What is the license?
Also: What scale would be good? That is: when seen in game, should coal have "a few big cracks", or "many small cracks"?

I created a tileable version of it, didn't do much else. So perhaps it should also be made equal-colored, despecled, blurred or something like that I am not good with that.
I hereby license the file coal-tileable.jpg under the CC-BY license
I like it because it looks like digable coal, which makes more sense than having a hard coal texture. Hard coal could also be mistaken with granite.
https://youtu.be/GzLvqCTvOQY?t=3m42s
https://youtu.be/GzLvqCTvOQY?t=3m42s
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