释义 |
pleonaste Min.|ˈpliːənæst| Also pleonast. [a. F. pléonaste (Haüy 1801), ad. Gr. πλεοναστός abundant, f. πλεονάζειν; see pleonasm.] A synonym of ceylonite, a variety of spinel. (From the multitude of faces of the crystal, each solid angle of the octahedron being often replaced by four faces.)
1804R. Jameson Syst. Min. I. 79 The ceylanite of La Metherie or pleonast of Haüy. 1831Brewster Optics xvi. 139 Black pleonaste and obsidian afford examples of solid substances which absorb all the colours of the spectrum proportionally. 1897Edin. Rev. Oct. 342 The almost black pleonaste..is used sometimes for mourning jewellery. |