Topaz is about 20-30 minutes west of Delta, UT.

On a sunny day in some areas, you can look for sparkles and pick topaz up off the ground. Other people take out sledge hammers and break the stuff out. From what I have seen they bring out decent sized topaz that is pretty dark. The stuff on the ground is light.
There is beryl out there. I like to find apache tears, it's opaque obsidian.