http://www.wisegeek.org/what-is-silica-sand.htm![]()
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I will have to research that and see what it looks like and what the difference is.
I just use sand from a local sand company but I know a lot of people don't have one in their area.
Please read this link. I believe you will find that unless your chickens are demolishing concrete or doing sand blasting without masks on then they should be okay in regular old sand. Silica is the chemical rocks break down into to create sand. Yep it's just plain old regular beach sand. Never trust information you get from a government agency such as the EPA, they have agendas. You can find other website articles that concur with the one the link takes you to. Just search silica sand.