| 单词 | orthoclase feldspar |
| 释义 | > as lemmasorthoclase feldspar A potassium-rich alkali feldspar which occurs widely in rocks and as free crystals, typically white or pink. Also more fully orthoclase feldspar.Pure orthoclase has the formula KAlSi3O8. Crystal system: monoclinic. ΘΚΠ the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > feldspar > orthoclase orthose1814 orthoclase1831 potash feldspar1845 potassium feldspar1894 1831 Edinb. New Philos. Jrnl. 11 388 Hardness equal that of orthoclase felspar. 1839 Jrnl. Franklin Inst. 24 219 Adularia or orthoclase. 1849 J. Nicol Man. Mineral. 119 All orthoclase from trachyte contains soda along with the potash. 1863 S. R. Graves Yachting Cruise Baltic 142 The felspar of this quarry is of two kinds, orthoclase and oligoclase, in large masses, the former pink, and the latter quite white. 1900 Sillman Mineral. 87 Ground orthoclase is extensively used as a glaze. 1933 Ecology 14 391 According to Paige..the reddish tone of the granite is largely due to potash feldspars in the form of microcline, orthoclase, and albite-oligoclase. 1955 Sci. Amer. Apr. 79/1 Granite is made up of three principal minerals: quartz (SiO2), albite feldspar (NaAlSi308), and orthoclase feldspar (KAlSi308). 1990 C. Pellant Rocks, Minerals & Fossils 13 Luxullianite. Tourmaline is a common accessory in many granites and in this rock pink orthoclase has much altered margins surrounded by black tourmaline and some grey quartz. < as lemmas |
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