| 释义 |
sellaite Min.|ˈsɛləaɪt|
[a. It. sellaite (Strüver 1868, in Atti d. R. Accad. d. Sci. di Torino: Classe di Sci. fis., etc. IV. 35), f. the name of Q. Sella (1827–84), Italian mining engineer and mineralogist: see -ite1.]
Native magnesium fluoride, MgF2, occurring as fibrous aggregates of colourless tetragonal crystals.
1872G. J. Brush Dana's Syst. Min. (ed. 5) App. i. 14 Sellaite... Found with anhydrite at Geibroula in Piedmont. 1923J. W. Mellor Comprehensive Treat. Inorg. & Theoret. Chem. IV. xxix. 296 Warm crystals of sellaïte show a faint violet luminescence with cleavage. 1933Mineral. Abstr. V. 238 Microscopical examination of the dolomite of bore-cores from the southern Harz showed the presence of sellaite as minute (0·04–0·075 mm.) tetragonal prisms. 1968I. Kostov Mineralogy 189 Sellaite is isostructural with rutile.., the chain type of structure explaining its perfect {ob}110{cb} cleavage, prismatic to acicular habit, and optically positive character. |