Japanese black petrified wood and blue opal from Gifu Prefecture
White and blue opal made of large black petrified wood from Nakakawabe, Gifu Prefecture. Although the area is small, it is famous for being able to mine ash zeolite and elion zeolite. Another type of wood is silicified wood, which is wood that has been incorporated into tuff and has become silicified. The petrified wood […]
