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  • Carli Lubowitz

    Lake Superior Thunderegg #minerals #rocks #Gemstones| http://colorfulgemstones.13faqs.com

  • Lindy

    Plume agate

  • Jennifer Johnson

    Lake Superior Thunder egg - A thunder egg is a nodule-like geological structure, similar to a geode, that is formed within a rhyolitic lava flow. Thunder eggs usually look like ordinary rocks on the outside, but slicing them in half and polishing them may reveal intricate patterns and colors. They usually contain centres of chalcedony in the form of agate, jasper or opal. Also frequently encountered are quartz and selenite crystals, as well as various other mineral growths and inclusions.

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