Greensand
Sand or sandstone which has a greenish color / From Wikipedia, the free encyclopedia
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For other uses, see Greensand (disambiguation).
Greensand or green sand is 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 of a mixture of mixed-layer clay minerals, such as smectite and glauconite. Greensand is also loosely applied to any glauconitic sediment.[1][2][3]