I agree that chrysoprase is not transparent, altho’ really good chrysoprase can come close. If it is singly refractive and your numbers on SG and hardness are correct, I can’t think of anything but glass…however, distinguishing whether it is a tektite or a synthetic glass can be very difficult. The faceted stone looks brighter than most tektites, but that isn’t conclusive. You might take it to some local university geologists. If it becomes a real head scratcher, maybe they have lab instruments or will recommend you send it to GIA. -royjohn
2 Likes