Glass Mountains (or Gloss Mountains) are in NW Oklahoma. They get their name because of the shiny rocks embedded in the mountain sides. It's worth a stop if you are going to Roman Nose State Park or to the Great Salt Plains, but is probably not worth a daytrip from the OKC metro area.
This is what the Glass mountains look like from a distance.
The rocks that shine are selenite crystals.
There were a few wildflowers in bloom when we visited a couple of weeks ago.
But because it was a warm day, and because these were the only high ground for miles, there were lots of birds soaring in the thermals.