orthite Min.
(ˈɔːθaɪt)
[= Ger. orthit (Berzelius, 1817), f. Gr. ὀρθός straight: see -ite1.]
A variety of allanite, found in long slender crystals, or straight masses.
| 1817 in T. Thomson Ann. Philos. IX. 160 Orthite so named because it always forms straight radii. 1868 Dana Min. (ed. 5) 289 Orthite occurs in acicular crystals sometimes a foot long at Finbo near Fahlun, and at Ytterby in Sweden. |
Hence orˈthitic a., of the nature of orthite.
| 1843 W. Humble Dict. Geol., Allanite, an orthitic melane-ore. |