Min. [f. prec. + -ITE. (Named Labradorstein by Werner in 1780, because it came from Labrador.)] A kind of feldspar, which shows a brilliant variety of color when turned in the light.
1814. Allan, Min., 18. Opalescent [felspar], Labradore stone … Labradorite.
1850. Daubeny, Atomic Theory, xii. (ed. 2), 417. Recent lavas … are made up principally, of labradorite, a silicate with 1 atom only of acid, and of hornblende or augite.
Hence Labradoritic a.
In mod. Dicts.
