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As far as I can understand the word Awasedo ( 合砥 ) is derived from the japanese verb awaseru ( 合せる ) and the word toisi ( 砥石 ).
awaseru ( 合せる ) is japanese for what we call "to strop" or "to hone" (...

I have got no beef with you. Your point of view sticks to geological approach. It's OK.
My POV sticking to what japanese woodworkers and razor sharpeners use to call their stones.

As for Karasu/Awasedo I should clarify my point of view.
I use the word 'strata' for what japanese call 層 ( http://jisho.org/kanji/details/%E5%B1%A4 ) and you call as a layer.
I use 4 clades to...

Hi, Maxim!

I am glad to meet you here!


Have you ever seen Oohira stones with 正本山合砥 ( Shou Hon Zan Awasedo ) stamp? I have never seen such stones.
The same is for Hideriyama.

The hardness of Oozuku stones varies a lot. Some are of medium hardness (3 of 5), some are semi-hard, some are very hard...
The structure and friability of grain of Nakaya stones usually are better...

The "hada" ( jp. 肌 = skin on back side of the stone), coloration and character of fracture surfaces are looking like real Nakayama.
The stamp 正本山合砥 ( Shou Hon Zan Awasedo ) is also the sign of ...