or.tho.clase
n.（名词）A variety of feldspar, essentially potassium aluminum silicate, KAlSi3O 8, characterized by a monoclinic crystalline structure and found in igneous or granitic rock. Also called potash feldspar 正长石：一种长石类，特别是钾、铝、硅合物，KAlSi3O 8，其特征为单颗晶体结构，发现于火山岩或花岗岩中 也作 potash feldspar
来源：Greek ortho- [ortho-] 希腊语 ortho- [前缀，表.直的，正的.] Greek klasis [a breaking] from klan [to break] 希腊语 klasis [分裂] 源自 klan [打破]
