It might be one from the infamous "French Drain" dig. It does appear to be a dug marble, maybe this is what you're looking for. I know nearly all the Akro Supermen and Indian Blankets along w/ several strange looking oxbloods were dug @ this site. Not having dug there all I have is word of mouth and a few articles on the subject, I do have one translucent olive based oxblood patch from the dig, some Supermen and an Indian blanket or two but that's it. Somebody w/ a little more insight on this matter than me will chime in, just providing you the info I have "good Luck"