Anyone know anything about Glittering Greensand? Though this is an organic gardening product, I thought I'd ask around and see if anyone knew if it would be harmful for chickens if they pecked at it and ingested any of it? Supposed to be iron and potassium rich. My babies are only a month old, so I definitely don't want to do anything detrimental to their development. http://www.ladybugbrand.com/products/Glittering-Greensand.asp I apologize if this is the wrong spot to post this, I wasn't sure where it should go.