2 Pounds - Clinoptilolite Zeolite Powder 4 Ounces of Zeolite Powder by The Seed Supply Zeolite, which is of volcanic origin and contains the distinctive mineral Clinoptilolite, is an 85% opaline silica and is widely used as a soil amendment for it's ability to increase water retention in the soil and allow plants to more easily access it. Unbelievably, it can hold up to 55% of its weight in water and slowly releases it to the plant as needed. Zeolite is a naturally occurring, negatively charged product of sea water and hot magma. This is used for external use only, DO NOT CONSUME INTERNALLY.