This is an impressive eye on this agate. How it became so big is a geological enigma. It certainly begs the question of how precisely agates form and why they have so many varieties. 
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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.
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These form in amygdaloidal basalt. :)
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Nice!
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how much do they cost?
and where are they often get found?
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They can vary in value based on size, fractures, type etc. some for just a few dollars and some worth hundreds or more. The ones i post were all mined by myself and a friend in Michigans Upper Peninsula.
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Thanks man..I followed u..hope I can find more info about em..
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