| 单词 | heavy mineral |
| 释义 | > as lemmasheavy mineral heavy mineral n. (see quot. 1971). ΘΚΠ the world > the earth > minerals > types of mineral > [noun] > other general types fluor1610 sulphur1799 amygdule1877 heavy mineral1893 fem1902 sal1902 stress mineral1913 opaque1960 1893 A. Geikie Text-bk. Geol. (ed. 3) ii. ii. 129 These heavy minerals constitute sometimes as much as 4 per cent of the Bagshot sand. 1939 Proc. Prehistoric Soc. 5 109 A heavy-mineral analysis of a sample of the sand. 1971 I. G. Gass et al. Understanding Earth xiii. 166/2 Rather more satisfactory from the point of view of recognising parent rocks is the presence of a small proportion (often less than 1%) of what are known as ‘heavy minerals’. These have a greater specific gravity than the common minerals quartz and feldspar (hence the name), and are separated by breaking up the rocks and floating off the lighter minerals in a heavy liquid (bromo~form, S.G. 2.89 is commonly used). Assemblages of heavy minerals may be characteristic of certain groups of parent rocks. < as lemmas |
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