d.k., it is mined from a mineral deposit in Utah or somewhere near. It is supposedly composed of many minerals and trace elements. I use it in my small garden beds and my plants do very well, with few or no pests, which is good because I grow organically and don't like to have to deal with garden pests. As far as poultry, it is claimed that it helps them grow stronger and more quickly and more resistant to diseases. GOOGLE "azomite" for some more info. I heard about it from the book mentioned earlier.
* Sounds closely related to DE-- I'll look it up. I like to try to keep my yard as organic as I can, though it's tough with all the tremdously growing invasives we have!!!! Round-up seems to be everybody's best friend!! ~