n. 绿砂

[机] 湿砂

[ noun ]
an olive-green sandstone containing glauconite
<noun.substance>

Greensand \Green"sand`\ (-s[a^]nd`), n. (Geol.)
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.

Note: [hand]Greensand is often called {marl}, because it is a
useful fertilizer. The greensand beds of the American
Cretaceous belong mostly to the Upper Cretaceous.