At the foot of the Kasen-Zan mountain, there is a village named Tamatsukuri meaning "bead making". In this village, a bluish, sometimes reddish chalcedony, which is found on the mountain of Kasen-Zan, was proceeded. Today, artifacts from this jewelry material can be visited in the local museum.

Hideharu Yamada is offering a lot of information about japanese agate and others on his website www.lithos-graphics.com.