Dec 03, 2016 · I have been working with the St Cloud Granite, and milled some up today, you can see the rock on the picture next to the milled granite, it has layers after settling, and some of it looks like iron ocher, even after sitting one day i get this fine material that just will not settle down so i pour that into a jar and add some vinegar and it settles out, but it is so fine i have to put it in