Yes, it is used for dusting flowers, and keeping away pests, stocked in garden centers, you will need to sublime it though, as it is impure.
And JESUS, that is one hell of a long rattlesnake, I wouldn't want to get bitten by that thing, timber rattlesnake? canebrake? or whats that other one, Crotalus horridus, whats the "common" name for that thing?