I have some very nice untreated Kingman turquoise that was my dad's that I had previously asked and received information about here. I noticed on ebay that a number of sellers (but it may all be the same seller operating under different names) have posted what they claim is natural, untreated turquoise, but it looks nothing like mine. Sometimes they identify the name of the mine, sometimes they indicate it is "hubei" (presumably meaning from China), and sometimes they don't say anything about the source. It generally sells fairly cheap and many of the pieces are very large. Out of curiosity, I bought a few pieces but am stumped. Is this what lower grade turquoise looks like, is this a fake, is it a conglomerate of some kind, or what? Posted below are a few pictures of some pieces for your thoughts. The first three are small stones. The last two pictures are of the same very large 1200 ct. stone. The small stones have no smell and the black one is very light weight whereas the larger brown one is relatively heavy. The larger stone definitely has an acrid, possibly paint-like smell to it and is heavy. Supposedly, it is all untreated, but I sincerely doubt that.