Greensand - Greensand in "Earth Friendly Packaging" - 2 Pounds This iron-potassium silicate is mined from natural deposits in the Garden State itself, New Jersey. Greensand loosens clay, increases moisture by up to ten times and contains over 30 trace minerals These properties make it a perfect soil conditioner for both agricultural and horticultural applications. Greensand (0-0-3) turns dense, heavy clay into manageable soil. Mined from deposits in the U.S., Greensand is a naturally-occurring iron-potassium silicate that can hold ten times its weight in moisture Also contains over 30 trace minerals.