I have taken that leap!
I went down to the local Nitron store (Just the company name) and picked up 50 pounds of paramagnetic rock.
The folks there were nice enough,
It kinda sounds like a lot, but it was only a 5 gallon bucket of mineral.
When I got home with it I really was surprised to the fact that it
really is magnetic. I dropped a magnet into it and rock stuck to it.
It looks like black sand,
They said this mineral was trucked in from Canada,
I have tomatoes and marigolds that are about 2 weeks old that I had started and set out for the fall season, I spread the sand on top of the mulch and watered it in, it measured out to be about a cup around each plant. I use all organic methods of gardening, no commercial or manufactured chemicals or fertilizers. But I have several compost piles of varying ages which is blended in during the initial planting, and then watered in with a compost tea. (How British, eh)
This is essentially day 1 of this venture.
I have found that if you click on the pic, it will enlarge to view better.