unisilicaten.
/ˌjuːnɪˈsɪlᵻkət/, /ˌjuːnɪˈsɪlᵻkeɪt/, U.S. /ˌjunəˈsɪləˌkeɪt/, /ˌjunəˈsɪlᵻkət/ Mineralogy. Now disused.
Any silicate regarded as a compound of silica and a protoxide or sesquioxide of a metal, with equal numbers of oxygen atoms in the two components.
ΘΚΠ
the world > the earth > minerals > types of mineral > silicates > [noun] > uni- or tri-silicate
unisilicate1867
trisilicate1902
1867 J. D. Dana in Amer. Jrnl. Sci. 94 90 Among unisilicates—the silicates which have the ratio 1:1 between the oxygen of the bases and silica (SiO2), and the number of atoms of oxygen 4, or its multiple—tetragonal species are common.
1879 F. Rutley Study of Rocks x. 140 In chemical composition the garnets are essentially unisilicates of different sesquioxides and protoxides.
1879 J. D. Dana Man. Mineral. (ed. 3) 242 In the Unisilicates, one molecule of silicon is combined with two of an element in the protoxide state..; or with two-thirds of a molecule in the sesquioxide state.
1917 B. K. Emerson Geol. Mass. & Rhode Island i. 84 Silica..has united exclusively with magnesia to form a unisilicate.
1953 E. W. Heinrich et al. Stud. Nat. Hist. Micas 26 The general section of hydrous silicates. Includes all hydrous silicates except the zeolites and margarophyllites. a. Bisilicates. b. Unisilicates. c. Subsilicates.
This entry has been updated (OED Third Edition, September 2015; most recently modified version published online March 2022).
<
n.1867