| 单词 |
rock crystal |
| 释义 |
rock ˈcrystal
[rock n.1]
1. Pure silica or quartz in a transparent and colourless form, most usually occurring in hexagonal prisms with hexagonal pyramid ends.
1666Phil. Trans. I. 362 Rock-Crystal is not fit for Optick-Glasses. 1716Lady Montagu Let. to C'tess Mar 8 Sept., In almost every room [are] large lustres of rock crystal. 1786tr. Beckford's Vathek (1883) 79 Beneath a vast dome, illuminated by a thousand lamps of rock crystal. 1854Pereira's Polarized Light (ed. 2) 19 Quartz or rock crystal is used, under the name of Brazil pebble, as a refracting medium for spectacles. 1878Huxley Physiogr. 59 Rock-crystal is sometimes found in crystals of gigantic size; at other times in excessively small specimens.
2. A piece of this.
1839H. T. De la Beche Rep. Geol. Cornw., etc. xv. 496 Rock-crystals are, as might be expected, somewhat frequent among the quartziferous veins in the granite. 1867A. Billing Science of Gems 54 It has just been shown that quartz (rock) crystals are stalagmitic in their nature. |
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