Sand for potting mixes
Leo Martin (Sun, 16 Nov 2014 12:55:52 PST)

Sand sold for construction purposes can vary a lot between different
US states. Transportation costs for dense materials are substantial,
so it tends to be mined not far from where it will be sold.

I have noticed the masonry sand sold here in metro Phoenix at big-box
stores and specialized masonry suppliers is very different from that
sold in southern California. The low desert in Arizona has streambeds
full of many different rock types.

Leo Martin
Zone 9?
Phoenix Arizona USA