Epidote

Large boulders with epidote on roadside in the Bighorn Mountains west of Buffalo, Wyoming today.

Green River Rocks

This beauty I found in Hot Springs County, Wyoming in a creek.

This third image is with the stone wet.  I did not tweak the color in any of these photos; I only sharpened the images to improve their clarity.

As can be seen, these rocks are considerably large and perfectly smooth and orb shaped -- I would love to see them as edging around a garden, a woodland path, etc...