This is a clay ore, but it's a natural Amakusa stone with a beautiful wood grain pattern, just like wood. Many buyers have purchased it as a whetstone and have given it good reviews. However, I'm not sure if the dimensions and condition are suitable for a whetstone, so I'm also listing it as an (Amakusa whetstone). I'm a novice who doesn't even know how to sharpen a knife, but I tried sharpening a knife on a different shaped Amakusa stone in stock. The stone was wetted with water, and because there was a lot of brown, it felt hard. However, I believe that the more you use it, the more it will become familiar, and the sharpness will improve dramatically, and the sharpness will last longer. It also stands out as a kitchen interior. I would like those who have never sharpened a knife with an Amakusa stone to try it. I don't think there will be any problems due to the nature of the product, but we cannot guarantee its use after purchase. Please understand. Those who are interested in this product are likely knowledgeable about natural whetstones. I hope you will understand my listing, as I have no knowledge of Amakusa whetstones, and I hope you will like it. Although it is an unused stock item, there are some chips in places. Please check the product images. Besides whetstones, it has a beautiful pattern, so I think it can be used in various ways. Please consider it. Amakusa Whetstone Natural Whetstone Display Stand Cooling Mat Interior Board Wall Material Knife Whetstone Knife Sharpening Kitchen Interior Kitchen Mat Kitchen Board Cutting Board Coaster