单词 | ice-spar |
释义 | ice-sparn. Mineralogy. Now rare. A transparent form of feldspar with a glassy lustre, found in lavas from the volcano Vesuvius. ΘΚΠ the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > feldspar > orthoclase > varieties adularia1789 ice-spar1816 necronite1819 murchisonite1827 rhyacolite1831 Amazon-stone1836 ryakonite1837 krablite1844 1816 J. Mawe Descr. Catal. Minerals (ed. 2) 54 Ice Spar. This is probably a variety of the above [sc. glassy felspar] in thin lamina. It occurs with meionite; from Vesuvius. 1837 J. D. Dana Syst. Mineral. 301 Gismondine..in small purple colored crystals in the drusy cavities of ice spar and other volcanic minerals, at Vesuvius. 1869 J. Phillips Vesuvius x. 291 Nepheline found in ejected blocks on Somma, with icespar, garnet, and mica. 1921 J. A. Audley Silica & Silicates ii. 91 Varieties of orthoclase include..adularia and ice-spar, transparent or translucent, and nearly colourless, including moonstone with bluish opalescence. This entry has been updated (OED Third Edition, December 2012; most recently modified version published online March 2022). < n.1816 |
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