Azomite is a blend of minerals (complex silica ore) sourced from a particular volcanic ash deposit in Utah, USA. Advertised as containing over 70 minerals, this product is said to help remineralize soils in growing spaces. Azomite comes in several forms (micronized, granulated, field, ect ect) which effects how quickly it is available for plant uptake.
Azomite has been on the market for some time now and I have seen a mixture of reviews on the product. Some folks swear by it. Some folks think there are better options out there and don't see a use for it.
I fall somewhere in between. A lot of my growing spaces are high in layers of organic matter. I like my deep mulches and compost layers! I have utilized azomite to freshen up some of these areas and believe to have seen an improvement in yields the following years. I don't go out of my way to use it often, but I treat it as some insurance against the Law of Minimums. I'm especially interested to see the effects that the minerals have on my orchard spaces.