greisen

名词 greisen:

1. a granitic rock composed of quartz and mica

grei.sen

n.（名词）
A granitic rock composed chiefly of quartz and mica.
云英岩：一种主要由石英和云母构成的花岗石

来源：
German
德语
from greissen [to split]
源自 greissen [分]