| 单词 | black opal |
| 释义 | > as lemmasblack opal black opal n. a very dark variety of opal; a piece of such opal. ΚΠ 1751 J. Hill Hist. Materia Medica 298 We sometimes meet with blackish Opals, which shew no other Colour in any Light, only the Red.] 1771 J. Hill Fossils 201 (table) Black opal. 1884 Encycl. Brit. XVII. 777/2 The so-called ‘black opals’..consist of this matrix [of dark brown ironstone] penetrated in all directions by veins and spots of opal. 1948 R. M. Pearl Pop. Gemol. v. 228 The tendency of black opal..to be deposited in very thin seams makes it often necessary to include a piece of the country rock..to provide a substantial support. 1996 J. T. Hospital Oyster (1997) 357 Lightning Ridge is where the serious deals are, and besides, they know black opal when they see it. < as lemmas |
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