Organic GreenSand 0-0-0.1 is a mined mineral, rich in the soil-conditioning element Glauconite. Acts as a soil conditioner for organic gardening. Contains 6% total potash. 0.1% available immediately. Rich in trace elements. All natural, non-burning, purest Greensand obtainable. Glauconite deposits are of marine origin and are composed primarily of iron-potassium silicate, which gives it it's bluish green color. Potassium is an essential nutrient needed by all plant life.