Strong seedling starts... anybody else try volcanic rock powder?

Just wondering if anyone else got hold of some volcanic-rock powder and tried it as part of a seedling-start mix, or part of a growing bed soil?
 
Just found out today that there is someone trying to import Azomite into Canada, to be the national distributor - and he has a garden-supply center about a 35-minute drive from our place here. It's tied up in red tape, and has been for about a year or more. But he thinks he may be in a position to get shipments by June sometime. Sure wish he had it by early May!
 
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