An olive-green sandstone containing glauconite

Wiktionary Word definitions in Wiktionary
n. (context geology English) A greenish sandstone containing glauconite.

Wikipedia Word definitions in Wikipedia
Greensand or Green sand is either a sand or sandstone , which has a greenish color. This term is specifically applied to shallow marine sediment , that contains noticeable quantities of rounded greenish grains. These grains are called glauconies and consist ...

WordNet Word definitions in WordNet
n. an olive-green sandstone containing glauconite

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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 ...