单词 | alkali feldspar |
释义 | > as lemmasalkali feldspar alkali feldspar n. Mineralogy any mineral of the feldspar group which is rich in sodium and potassium; spec. one in which potassium is more abundant than sodium or calcium. ΚΠ 1897 Philos. Trans. 1896 (Royal Soc.) A. 187 196 These rocks consist mainly of an alkali-felspar with more or less quartz and certain accessory minerals. 1948 R. M. Pearl Pop. Gemol. iv. 178 Like orthoclase, microcline is a so-called potash or alkali feldspar and has the same chemical formula. 2002 Oxoniensia 66 143 The sectioning of the fragment..has shown that the white flecks are phenocrysts of alkali feldspar. < as lemmas |
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