Greensand

[gri:nsænd]

解释:

(noun.) an olive-green sandstone containing glauconite.

校对:路易斯--From WordNet

解释:

(n.) A variety of sandstone, usually imperfectly consolidated, consisting largely of glauconite, a silicate of iron and potash of a green color, mixed with sand and a trace of phosphate of lime.

整理:肯尼思