The Red Metal Retreat book on the minerals and mine dumps mentioned that there are some agates at St. Louis Mine so we went there to investigate. Yep, there are some pink to purple agates all over but mostly really small and larger ones are usually fractured.  I stumbled into a datolite fragment when it was raining and that was an unexpected find. The rain brought its green color out that would have gone unnoticed when dry. So next year, I came back to the same place and poked at the rocks and one large datolite just rolled out. After that, I did some digging and found some more datolites. Turned out that they're grayish to green with so much copper specks all over and some are orangish due to iron straining (they're porous).  They may be not pretty datolites but they're quite cool. :)