gadolinite Min.
(ˈgædəlɪnaɪt)
[Named in 1802 after the mineralogist Gadolin: see -ite.]
Silicate of yttrium, found in black crystals.
| 1802 Nicholson's Jrnl. III. 251 The earth last discovered in gadolinite. 1807 T. Thomson Chem. (ed. 3) II. 70 Hitherto yttria has been found only in the black mineral first analysed by Gadolin, and hence called Gadolinite. |
| attrib. 1883 Athenæum 14 Apr. 480/3 The principal gadolinite earths—yttria, terbia, erbia, etc. |