Akama Stone
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"Yamaguchi Prefecture's famous for be the Motherland of great people who changed the history of Japan. It is a Mesozoic stone and is reddish brown to purple of the bright green tuff.The stone quality is characterized by its strong stickiness, fine quartz and iron, and smooth.There are about 10m of the formation where AKAMA stone is produced, but only 1m of it can be used as a material. It has a deep history as a material for ink stones and dates back to medieval Japan. There is also an arty value, and it is traded at a high price. The AKAMA ink stone, which is said to have been dedicated by Shogun Minamoto no Yoritomo, still exists in Tsuruoka Hachimangu Shrine. The name comes from the beginning of production of ink stones in AKAMA Stone, Shimonoseki City.
In 17th century to 19th century, it could not be mined without the permission of the Choshu Domain, and the distribution volume was limited and it became a ""phantom masterpiece"". Because it became a valuable article that was not easily obtained, it was used as a gift to the feudal lord.Even now, it is prohibited to take large raw stones out of the prefecture."