- Main Entry:
- gad·o·lin·ite

- Pronunciation:
-
\ˈga-də-lə-ˌnīt\
- Function:
- noun
- Etymology:
- German Gadolinit, from Johann Gadolin †1852 Finnish chemist
- Date:
- 1802
: a black or brown mineral that is a source of rare earths and consists of a silicate especially of iron, beryllium, yttrium, cerium, and erbium