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The Collaborative International Dictionary of English v.0.48 (gcide)

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]

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