Repost: Guest Videos: Gneiss and Gold

It’s great to go for a hike with someone who knows what they’re looking at.

Wait. Gold? You’re ending the video right after mentioning gold?

Well, let’s head up to the Yukon and get some gold in the pan!

But how do you know that the shiny yellow stuff you’ve just collected is gold, not pyrite?

Featured image: Acasta gneiss from Canada, by Mike Beauregard, CC BY 2.0. The yellow color is probably lighting; this rock’s value is only in its age: over four billion years old!

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