a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
例句
a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime. 一种软质的银色稀土属金属元素，见于硅铍钇矿、独居石和磷钇矿中。
a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime 一种软质的银色稀土属金属元素，见于硅铍钇矿、独居石和磷钇矿中
2.a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime. 一种软质的银色稀土属金属元素，见于硅铍钇矿、独居石和磷钇矿中。
a soft silvery metallic element;a rare earth of the lanthanide series;it occurs in gadolinite and monazite and xenotime. 一种软质的银色稀土属金属元素，见于硅铍 钇 矿、独居石和磷 钇 矿中。
4.a soft silvery metallic element;a rare earth of the lanthanide series;it occurs in gadolinite and monazite and xenotime. 稀土属金属元素，用于激光中，见于磷灰石、独居石、磷钇矿和硅铍钇矿中。
