Again, I received these as a gift so I do not have any background information on them. My relative who gave me these lives in the Las Vegas area so these could have come from around there or elsewhere in Nevada, possibly even California or anywhere in that region. I honestly don't even really have a guess for any of them. I did notice how the inside of the white rock on the left had a similar "look" to that of selenite but I'm almost positive that it isn't. It was the cut and the lines typical of a piece of selenite that made me assume that. Thank you in advance.