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This natural fertilizer (described in Secrets of the Soil as rock dust) is actually an ancient deposit of aluminum silicate clay and marine minerals. In use for over 50 years as a source of available potash (0.2%) and over 70 trace minerals, including calcium (1.8%), sodium (0.1%), and magnesium (0.5%).
This product should be suitable for use in organic agriculture as it has been deemed to be compliant with the USDA National Organic Program. However, as the status of any product can change at anytime, please always confirm that this product is allowed by your certifying agency.