钍石类矿物是比较不常见的,过去在我国还没有发现过。作者等在调查我国北部花岗伟晶岩时,在某些地区发现了钍石类矿物。由于其中含有大量的钍和相当量的铀,所以在作为放射性元素的资源方面,或在矿物学的意义上来说,都值得予以注意。钍石类矿物产于黑云母型和两云母型的花岗伟晶岩中,与褐帘石、(?)钇矿、独居石、(?)铁矿及绿柱石 Thorites are less common minerals that have not been found in our country before. When investigating the granitic pegmatites in northern China, the authors found thorium-based minerals in some areas. Due to its large amount of thorium and a considerable amount of uranium it deserves to be noted in terms of resources as radioactive elements or in mineralogy. Thorites are produced in biotite and mica-hosted granitic pegmatites, and are associated with brown curtain, (?) Yttrium, monazite, (?) Iron and beryl