anorthite Min.
(æˈnɔːθaɪt)
[f. Gr. ἀν priv. + ὀρθ-ός straight + -ite; named by Rose in 1823.]
‘Lime-feldspar,’ a mineral placed by Dana in the Feldspar group of Unisilicates, and occurring in small triclinic or ‘anorthic’ glassy crystals.
| 1833 Lyell Elem. Geol. (1865) 590 Anorthite, so called from the oblique interfacial angles of its rhomboidal prisms. 1869 Phillips Vesuv. x. 288 Christianite or Anorthite occurs in ejected blocks on Somma in cavities of dolomite. |