oligoclase

1. The rock shows finegrained granitic texture and consists of perthite, oligoclase, quartz and biotite.
   岩石呈细粒花岗结构，矿物成分为条纹长石、更长石、石英和黑云母。
2. Inclusions in corundum megacryst from alkali basalt,ⅰ. the discovery of oligoclase inclusions and its significance
   玄武岩中刚玉巨晶的包体研究：Ⅰ.更长石包体的发现及意义

noun

1. any of a series of triclinic feldspars that form rocks

   Synonym:    plagioclase