Sorry that I did not see this earlier (was not a member, just joined) and that i have responded to an older thread. I have seen two other pieces identical to this material, one on an online auction (I was bidding, but unfortunately forgot to watch the timing and lost out), and the other in a private collection in the pacific northwest. I was asked not to say anything about specific locality info, but there was an old cloth label on the bottom of the piece in the private collection that noted it was Howardite from a location in northwest Nevada, I cannot be any more specific than that. Based on what I have seen and handled, the material closer to the surface was wavy like this and was also bleached on the outside. I have handled quite a bit of the Howardite material, better known as Rattlesnake Jasper, and I think your pieces are likely from the original discovery and probably from right along the surface. I have not seen much like this and these pieces should be treasured. My personal collection of Howardite numbers just over 300 pieces, and I do not have anything like this and have only seen two similar pieces, so in my opinion, QUITE RARE!!. Hope that helps.... Best regards, Chris