Amakusa grinding wheel

Japanese: 天草砥 - あまくさど
Amakusa grinding wheel
A natural whetstone produced on the Amakusa Island in Kumamoto Prefecture. It is a rough, brown, hard stone made mainly of sandstone and is used for rough whetstones.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 熊本県天草島に産する天然砥石(といし)。主として砂岩よりなる目の粗い褐色の硬い石で、粗砥に用いられる。

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