My wife's sister and her hubby have a headstone business and end up with about with about 200kg of Granite dust each year,i would imagine that there would be a lot of minerals in the stuff,but does anyone know what's its make up and is there anything in it avoid if i was to use it in the garden??
It was explained to me that Granite is a relatively rough (not smooth like sand) particle. Being rough it has lots of crevasses and corners for microbes to hide and grow. The microbes eventually decompose the granite adding potash to the soil...but it takes a long time. It helps to get those microbes working by adding compost, etc.
I don't know if they've done the same sort of surveys where you live, but here the USGS reported that there are some 53 trace elements in the granite of Rhode Island. It varies from quarry to quarry, but it's my belief that it's those trace elements you are after.
These are the things that make corn and carrots taste sweeter
They import there granite slabs from India so how mush the trace elements varies to that of the Rhode Island rock,??,wouldn't think it would a lot different though. So by the sounds of it its well worth using,seemed a real waste because all they were doing with it was sending it to the landfill.