Greensand is a rock dust that is also known as a ‘glauconite’- an iron/potassium silicate. It is the glauconite that gives this material its light green colour. This rock material contains over 30 trace minerals, along with calcium, phosphorus, iron, potassium and magnesium- all essential nutrients for plant health. Its origins are found in areas that were laid down under the seas of an evolving planet millions of years ago. The virtues of greensand have been extolled for years by gardeners who see the impact that the extra mineralization makes to the health, taste and nutritional content of plants grown where it was added to the soil