orthoclase

/awr-thuh-kleys, -kleyz/US // ˈɔr θəˌkleɪs, -ˌkleɪz //UK // (ˈɔːθəʊˌkleɪs, -ˌkleɪz) //

正长晶石,正晶石,正长石,正长石岩

Definitions

n.名词 noun

1
- : a common white or pink mineral of the feldspar group, KAlSi3O8, having two good cleavages at right angles, and found in silica-rich igneous rocks: used in the manufacture of porcelain.

There is also some variation in the amount of quartz present, and in the relative importance of the orthoclase and plagioclase.
Orthoclase becomes a clear glass filled with bubbles: at a lower temperature beryl behaves in the same way.
It often occurs as a constituent of granite, not unfrequently being associated in the same rock with pink felspar or orthoclase.
Sanidine, san′i-din, n. a clear glassy variety of orthoclase.
Vogesites contain hornblende and orthoclase; spessartites, hornblende and plagioclase.