Could have been rolled as an oracle. Although glass strikes me as not the best material for that. Especially ancient glass that didn't have all of the chemical

Could have been rolled as an oracle. Although glass strikes me as not the best material for that. Especially ancient glass that didn't have all of the chemical strengtheners that modern glass does It might have been just an object of contemplation. Like, you can see how all of the heavenly bodies fit snugly into a perfect geometric figure and just wonder at it. If there's any rhyme or reason to how the symbols are arrayed on the sides, it could have been a mnemonic or instructional device for casting horoscopes. And, while it's probably too opaque to have been used for scrying, there's that too.