No question no comment.
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Here is greensand on amazon: Amazon.com : Super Greensand Micronized, 68 Minerals and Trace Elements, 10 Pounds : Patio, Lawn & Garden
At $49 for 10 lbs IMO it’s a total ripoff. You can go down to any river nearby and dig up a sandy spot on the bank for free. It will also have 68 minerals and do anything greensand will do. Someone is doing just that to sell it to you.
I’d go to a spot of rich organic soil nearby your location and dig up a truck load of the richest looking stuff you can find. Add in the sand you find elsewhere and you don’t have to buy anything.
Amazon or eBay should have whatever you want to buy.
Green sand and granite dust are not fertilizers. Regardless of what sellers might tell you there is no way a plant cell or bacterium can break down covalently bonded silicas into a significant amount of nutrient in 10,000 years. However, having non-toxic sand in your soil mix is a good idea for soil texture and a substrate for micro-organisms. My soil mix is one 1.5 cu.ft. bag of Kellogg’s Patio Mix + one 1/2 cu.ft. bag of general purpose sand.
No question no comment.
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Home Depot, general purpose sand in 50 lb bags or by the pallet.
If there is a rock quarry near you, then ask them about “3/32 minus”.
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Eehhh, spring for a soil test and go for the real-chemical-name additives as needed.
I was short Boron. As in none. Boric acid ant and roach killer. Problem solved. One bottle is probably a lifetime supply for a suburbanite.
No Copper either. Just added one gram Copper Sulfate( 0.2 grams copper) dissolved in water to a very large potted tree.
Zinc was missing too. Zinc is a weird one because the humans who eat the stuff need it more than the plants. Can’t remember what I paid, but I had to actually pay fertilizer prices for it Maybe $4 a pound. Again, a little goes a long way type proposition.
Got a pound or two of general S.T.E.M.(soluble trace element mixture) From Custom Hydro Nutrients in case I was short Moly or something. I add a tablespoon to each side of the compost heap to round things out.
Overall, the cost is diddly if you spring for the test.
P.S. Don’t overapply just because it’s cheap. Apply according to directions. For a compost heap, visualize the heap spread out on the ground, guesstimate the square footage and apply according to directions.