Sedimentary clays are usually very impure, found in seas and some glaciers. Sedimentary clays are the result of devolution. For those who have esoteric interests, this is a big difference. Volcanic origin clays are at the beginning of the evolutionary process, and sedimentary clays are at the end of this process.
Sedimentary clays may be dangerous to use due to unknown contaminants and or a high level of substances such as lead, arsenic, cadmium, etc. Are some sedimentary clays recommended as edible clays? YES, they are. Is there good reason for this? Yes, there is. However, you need to be educated about the potential risks associated with these sedimentary clays.
The extremely pure calcium smectites(bentonite) and the sodium smectites(bentonite) prevelant for use as edible clays in the United States are evolutionary clays ( volcanic origin, and very, very clean ). One could ( and the author has ) drink as much clay water as the body can handle, and experience only benefits long term. One can safely use these clays for a lifetime. What we know about calcium bentonite and sodium bentonites is that they are almost always inert in the body. As such, they cannot directly cause any harm in the body. These are the only two classifications of clay that we know to be inert in the body: Clean calcium Bentonites and clean Sodium Bentonites. from eyton's earth.
All of our clays are volcanic in origin and are very clean. They are handled as food products. That is why we do not accept any returns. Once a customer has opened the clay there is no way we can assure that it is still safe. The only differences between our clays are the screen sizes and the type: Calcium(southern) Bentonite or Sodium(western) Bentonite.