| 单词 | zircon earth |
| 释义 | > as lemmaszircon earth zircon earth n. now historical and rare zirconia (zirconium dioxide). [After German Zirkonerde (M. H. Klaproth 1789 in Beobachtungen und Entdeckungen aus der Naturkunde III. 171); compare scientific Latin terra circonia (in the same source).] ΚΠ 1794 J. G. Schmeisser Syst. Mineral. I. 37 The other three [earths], as the adamantine spar earth, circon earth, and australis, have not been yet applied to any useful purposes. 1912 Mineral Industry 20 543 The zircon earth is in the trade in the powdered form. 2009 G. Roza Zirconium i. 8 Klaproth first named the new element Zirkonerde (zircon earth, or zirconia). < as lemmas |
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