![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/7/7e/Estonian_Museum_of_Natural_History_Specimen_No_173341_photo_%2528g1_g1-1623_1_jpg%2529.jpg/640px-Estonian_Museum_of_Natural_History_Specimen_No_173341_photo_%2528g1_g1-1623_1_jpg%2529.jpg&w=640&q=50)
Greensand
Sand or sandstone which has a greenish color / From Wikipedia, the free encyclopedia
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]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7e/Estonian_Museum_of_Natural_History_Specimen_No_173341_photo_%28g1_g1-1623_1_jpg%29.jpg/640px-Estonian_Museum_of_Natural_History_Specimen_No_173341_photo_%28g1_g1-1623_1_jpg%29.jpg)
![This image shows a rock and the occurrence of glauconitic siltstone in the Serra da Saudade ridge, in the Alto Paranaíba region, Minas Gerais state, Brazil.](http://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Glauconitic_Siltstone.jpg/640px-Glauconitic_Siltstone.jpg)