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I do think it's from Colorado. I followed some of the company names from the bay and they do have a quarry in Canon City CO. There is a lot of sandstone in that area.

Looks like it came from close to Canon City, Colorado. I'll have to poke around the next time I'm down that way. There is a climbing area close to their quarry that I used to frequent.

Any other info. I live in Colorado and have been rock hounding. I have not found anything useful as a finisher yet.