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If one takes speed of cutting/polishing as a function of 'stone roughness', or the size of abrasive particle of a particular hone
speed of cutting/polishing=f(rougness, size of abrasive)
Let's say,s= f*10 for the coticule I have. I think s= f*30 or more for this Turkey stone.
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Better pictures, colors are still mess though (black turned into gray, yellow color still unvisible):
Smooth side, obviously needs lapping:
http://img87.imageshack.us/img87/77/dsc00050f.jpg
The back side which I think belongs to some other rock:
http://img227.imageshack.us/img227/8333/dsc00052wf.jpg
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your pictures are not the best quality but i do think this is very fine turkey oilstone.