| 释义 |
magnesian, a.|mægˈniːʃ(ɪ)ən|
[f. magnesia + -an.]
1. a. Of or pertaining to, or containing magnesia.
1794Sullivan View Nat. I. 434 The five simple earths are, the calcareous, the ponderous, the magnesian or muriatic, the argillaceous, and the siliceous. 1799Tennant in Phil. Trans. LXXXIX. 309 Magnesian limestone may be easily distinguished from that which is purely calcareous, by the slowness of its solution in acids. 1807T. Thomson Chem. (ed. 3) II. 476 Magnesia has a very marked affinity for alumina... This affinity was first pointed out by Mr. Chenevix in his analysis of magnesian stones. 1812Sir H. Davy Chem. Philos. 33 In 1756 Dr. Black published his admirable researches on calcareous, magnesian, and alkaline substances. 1876Page Adv. Text-bk. Geol. v. 102 Dolomite is a granular or crystalline variety of magnesian lime⁓stone. 1882Rep. to Ho. Repr. Prec. Met. U.S. 622 This earth has a magnesian or chalky aspect.
b. magnesian limestone Geol., a name for the lower division of the New Red Sandstone rocks, now known as ‘Permian’.
1836T. Thomson Outl. Min., Geol., & Min. Anal. II. 142 The magnesian limestone begins at Tynemouth, and extends..as far as Nottingham. 1865Lyell Elem. Geol. (ed. 6) 456 For the lower, or Magnesian Limestone division of English Geologists, Sir R. Murchison proposed, in 1841, the name of Permian.
2. Min. [See -ian 2.] Of a mineral: having a (small) proportion of a constituent element replaced by magnesium.
1930W. T. Schaller in Amer. Mineralogist XV. 571/2 Magnesium-magnesian. 1951C. Palache et al. Dana's Syst. Min. (ed. 7) II. 503 Cuprian melanterite and pisanite are obtained from solutions containing added copper sulfate; and magnesian and other compositional variants may be similarly obtained by appropriate additions. 1968I. Kostov Mineral. ii. ix. 498 Kirovite a magnesian variety [of melanterite]. |