After 230 comments so far, I'm finding that the shots I score higher have great texture like yours does but also something else in the shot to break up the monotony of the texture. This is well done overall with great lighting, good dof choice for the subject, good contrast.... technically it's good and it fits the challenge. It just needs something to break up the monotony of the shot.
At first I thought this was crumpled paper even though the title told me otherwise. On second look I see it does look like 'rock'. I'd have given it a 10 but it seems just a tad bit soft. As is: 9
Effective use of lighting, but the central part of the image has much better grayscale tone than the rest. It's very detailed, but in a unbusy way which is very effective. It's a well composed and framed image with sharp detail giving an impression of texture in a unique way.
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