Greensand

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.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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