niocalite

n.[地]黄硅铌钙石

一种含有钍和钾的矿石，一种含有钍的钙石矿。

名词

1. Niocalite is a rare mineral that is often found in alkaline rocks.
钍钾石是一种罕见的矿物，经常在碱性岩石中发现。
2. The niocalite deposit in this region is of great interest to geologists.
该地区的钍钾石矿床对地质学家具有极大的兴趣。