whinstone

名词 whinstone:

1. any of various hard colored rocks (especially rocks consisting of chert or basalt)
   同义词：whin

whin.stone

n.（名词）
Any of various hard, dark-colored rocks, especially basalt and chert.
暗色岩：一种坚硬、暗色的岩石，尤指玄武石及燧石