Espoma Organic Green Sand 6 LBIn Store Location: @B8 Warehouse Location : A26 Espoma Organic Greensand Give your Beds a Boost with Organic Greensand by Espoma. Espoma Greensand is the highest quality, all natural, non burning, purest Greensand obtainable. Espoma Greensand is mined from natural deposits of glauconite. These deposits are of marine origin and are composed primarily of ironpotassium silicate, which gives them a bluish green color. Potassium is an essential nutrient