Found 2 items, similar to greensand.
English → English (WordNet) Definition: greensand greensand n : an olive-green sandstone containing glauconite
English → English (gcide) Definition: Greensand 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. [1913 Webster] 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. [1913 Webster]