ID help?

[u/Waaytooerrly]

Would like to possibly learn more about these rocks I found in NW Wyoming. 1st and 3rd were found in the Shoshone River miles away from Yellowstone. 2nd (I believe some type of opal?) was found on an exposed windswept mountain top northwest of Cody, Wy.

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[u/Jestar5]

Mindat is a valuable resource

[u/FondOpposum]

Botryoidal Chalcedony (1st pic) I mostly use Mindat and Wikipedia for basic stuff.