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RE: They EYE has it! Lake Superior Agate.

in #geology • 7 years ago

Agates form in igneous rocks, generally. As water seeps through the pore space of the igneous rocks, it picks up a lot of water soluble minerals. Then it deposits those minerals in gas bubbles, cracks, faults, and other open spaces in the rock, forming agates.

7 years ago in #geology by
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     7 years ago 

    These form in amygdaloidal basalt. :)

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