River sand is going to have some nutrients like silica and or calcium carbonate but it would take next to forever for it to break down in the soil.
Greensand is a hardened sediment not really a "true sand" and it takes time to breakdown into the soil but breaks down way faster than "sand" i.e...
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This is followed by a mixture of equal parts river sand(often called green sand) and coffee grounds(donated by my local Starbucks-also used to suppliment my compost in winter)
Greensand and River Sand are two different things.
River sand is just that river sand and is much like the...