akermanite, n. Min.
(ˈækəmənaɪt)
[ad. G. Åkermanit (coined by I. H. L. Vogt 1890, in Arch. for Math. og Naturvidenskab XIII. 323), f. the name of Richard Åkerman, 19th-cent. Swedish metallurgist: see -ite1.]
A silicate of calcium and magnesium, Ca2MgSi2O7 , belonging to the melilite series of minerals and occurring as transparent or translucent crystals of the tetragonal system.
| 1890 Amer. Jrnl. Sci. CXL. 336 Åkermanite.—A lime-magnesia silicate, containing no alumina, and belonging to the tetragonal system like melilite... It is not known in nature but has been obtained by Vogt. 1920 Ibid. CC. 131 The compound 2CaO.MgO.2SiO2 was discovered by Ferguson and Merwin... The mineral åkermanite was thought by them to consist essentially of this compound. 1975 Sci. Amer. Feb. 33/1 Melilite is a mineral whose composition can vary continuously between Ca2Al2SiO7 , known as gehlenite, and Ca2MgSi2O7 , known as akermanite. 1990 Jrnl. Petrol. XXXI. 557 Many of these minerals, including wollastonite, monticellite, and akermanite, are characteristic of low pressure. |