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日本已查明了許多放射陸矿物产地。对花崗岩地带伟晶岩中含鈾、钍及其他稀士矿物的情况已作了詳細的調查。在北上山地,阿武隈山地中部附近地方以及北部沿瀨戶內海一带及九州北部分布的花崗伟晶岩中都有蘊藏,特别是福島县石川地方大面积的伟晶岩中則更丰富。这种伟晶岩是花崗岩在地壳深处凝固时,其中含有較多水分等揮发物的部分就聚集了稀有元素。这一点可以从花崗岩的残余岩浆的痕迹得到証明。在开采陶瓷原料伟晶岩中的石英、长石的同时,稀有元素矿物也被当作副产品而回
Japan has identified many sources of radioactive mineral deposits. Detailed investigations have been carried out on the presence of uranium, thorium and other rare minerals in pegmatites in the granite area. There are deposits in the Kitakami mountain area, the central part of the Mount Awufang, and the granitic pegmatites distributed in the northern part of the Seto Inland Sea and the northern part of Kyushu in the north. In particular, the pegmatite in the large area of the Ishikawa area in Fukushima is more abundant. This pegmatite is a part of granite that solidifies in the depths of the earth’s crust and contains more water and other volatile substances. This is evidenced by traces of residual magma in the granite. In the mining of ceramic materials, pegmatite quartz, feldspar, rare elemental minerals are also used as a by-product back