Matt made the kids a sandbox and now I am on a hunt for sand. So, I called around to a couple landscape supply places and then Home Depot. When I called Home Depot, the gentleman I talked to said he wouldn't put the "play" sand they carry in his grand kids sandbox. I, of course, asked why... well, it apparently contains Crystalline Silica ( I haven't viewed the bag with it's coordinating warning label myself, I am taking his word for it at this point) which is a quarried quartz derived sand. Natural sand does not contain Crystalline Silica. Crystalline Silica is considered a human carcinogen and is known to cause silicosis, a non reversible lung disease - not good for developing lungs.
For more information on this: http://www.safesand.com/index.htm
I am still hunting for a safe alternative to this product and will let everyone know when I find it. If you have a suggestion, let me know. I am additionally going to call Home Depot corporate offices to let them know that I intend to go to our local tv stations with this information if they don't pull this product and issue a recall for all parents who have already purchased it.