What is the pH of limestone dust?
I have a walking path that is topped with something I get from the local quarry called Quarter Inch dust. It has small limestone (1/4 inch) gravel mixed with very fine limestone dust. I've noticed that some plants (usually the ones that like well drained soil) creep out into the path and really seem to like growing in the 1/4 inch dust path. So this got me curious as to what the pH of limestone dust is. This is not a white powder like lime you get in a bag. The rock and dust are gray.