John Polk wrote:I would imagine that glacial rock dust would vary greatly depending on where it was mined from.
As the base rocks of the mountain change from region to region, so will the mineral proportions they contain.
But it also comes from gamma rays from the sun and radioactivity in the rocks, such as granite, and radon, which comes from radioactive minerals in the earth that were deposited there by nature.
John Polk wrote:
Azomite and glacial rock dust are each used as mineral amendments for soils that are deficient in minerals. Either one could be a waste of money if your soil has the minerals it needs. A complete soil test will show which minerals need replenishing. It would generally be cheaper to just apply the minerals that are needed, than applying an A to Z blanket containing most everything.
The mineral content of the two products are quite different. Look for the one that matches your needs the best: