thorite

1. A soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands.
   一种软质、银白色、放射性四价金属元素，同位素用作核反应能源，见于钍矿和独居石沙中。
2. The enrichment for the three elements may be attributed to their downward migration due to dissolution of zircon and thorite by humus acid and adsorption by montmorillonite and amorphous iron oxides.
   Zr、Hf和Th在风化剖面上部有明显的富集，可能与矿物锆石与钍石在风化壳表层被腐植酸溶解后向下迁移被蒙脱石与非晶质氧化铁吸附有关。
3. New variety of thorite& plumbothorite
   钍石的新变种&铅钍石
4. Easy ways to distinguish the xenotime, the thorite and the zircon
   鉴别磷钇矿，钍石和锆石的简易方法

noun

1. a radioactive mineral consisting of thorium silicate