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Interesting! When I asked people about the vibrant green colour of some streams around here, I was told that it was because of some mineral.

Yep. That is true also. Here is Diablo lake in North Cascades NP. The green color is from sediment in glacial run off.

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So cool! I've been to similar places, and they're amazing.

What a green in the midst of the green -- how lovely!