Wollo Province

Again, just in the 1990s while you were in the driveway tripping on a Skip It.

But according to the 2020 paper, Petrogenic Origin of Mesozoic Opal Hosted in Ethiopian Miocene Rhyolites, apparently now the seat of volcanic Ethiopian opal is the Wollo province, and that wasn't discovered until 2008.

I have pants older than that.

And while Romans, they loved opals, so did Queen Victoria, these were mined from some small pockets in Europe.