| 释义 |
neptunite Min.|ˈnɛptjuːnaɪt|
[ad. Sw. neptunit (G. Flink (at the suggestion of N. O. Holst) 1893, in Geol. Förening i Stockholm Förhandl. XV. 196): see Neptune and -ite1. (So called because of its occurrence with ægirite, ægir being the Scandinavian god of the sea.)]
A silicate of sodium, potassium, iron, manganese, and titanium, (NA,K)2(FeII,Mn)TiSi4O12, which is found as black monoclinic crystals.
1895Mineral. Mag. XI. 100 Owing to the close similarity of the crystal angles to those of sphene, neptunite is placed in the titanite group. 1926Mineral. Abstr. III. 102 Neptunite has been found at eight spots in the Kola peninsula. 1950Mineral. Mag. XXIX. 27 The main point of interest in the new material is the presence here and there of the rare mineral neptunite in the syenite, a mineral previously unknown in the British Isles. 1966Doklady Acad. Sci. U.S.S.R. (Earth Sci. Sect.) CLXVI. 121/2 The pyroxenic structure of neptunite is typically apparent from the endless zigzag baroque columns, in which Ti and Mn octahedra connected by common edges alternate in pairs. |