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 green·sand /-ˌsænd/
 綠砂

 Green·sand 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: ☞Greensand is often called marl, because it is a useful fertilizer. The greensand beds of the American Cretaceous belong mostly to the Upper Cretaceous.
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 greensand
      n : an olive-green sandstone containing glauconite