Hello Mr. Yu Ken
Here is a picture of local whetstones from the same area they make the swords I shared with you earlier.
It is a soft slate like Tsushima but little finer.
Now I live in Riyadh city located at Najd region which is an absolute desert, we have many dry valleys that have alluvius that makes a great sand stones, down the valley are the hard fine polishers and the hillside you find the large particles sand stones, I have made a razor hone out of some fine one and they polish like a true hard ark, in fact I have sent one to a respected member in the shaving community in the US and he had a good shaves out of it.
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Saudi Nagura, similar to Botan Mikawa Nagura, But break down to reach Tenjou Mikawa Nagura level.
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Regards