Contrary to what Galen thinks, and all that he holds dear, I believe that Peltier made some aventurine glass intentionally. I saw no mention of aventurine in Peltier's glass formula notebooks, with all the glass batch results and notes from 1936-1937. I'm pretty sure, though, that if we had the glass formula notebooks from 1928-1934, when they were actually making that black glass with heavy aventurine, that they used in all those zebra types, NLR's, and black patches, there would have been a notation "Wow ! Nice sparkles in that black glass !" They did have quite a few different formulas for black glass, one for ashtrays, several for marbles...I think one was called "special black" that had potassium dichromate, but no mention of aventurine in the notes. Likewise, there was no formula for, or mention of "pearlescent green", but I wager they made that on purpose, too.
I would also mention, that of all the aventurine glass I have had experience with over the years, primarily in kilns or over a torch, and just two days at Jabo, only goldstone could do the disappearing trick. I never had problems with any other kind of aventurine disappearing when reheated.