My early quest took me to local quarries where they had tons of granite and marble dust. It was there that their representatives told me that I was free to get all I wanted, but that it takes hundreds if years for anything but the very finest powder to be usable by plants. As I said, I'm no geologist, but also know that many scientists question the cost versus benefit of some of the rock dust being marketed as miracle blends. Obviously, that is not to say that it includes all rock dusts or all situations. There are many soils and applications that would benefit from the right mineral formulations, while others are more suited for things like drainage.
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