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Lake Superior Thunderegg, the stuff of Native American legend. Have to check into that.

Holy crap. I would LOVE to have this... Amazing Rainbow Agate. Photo: Pascal Petit on flickr  Geology Wonders

Holy crap. I would LOVE to have this... Amazing Rainbow Agate. Photo: Pascal Petit on flickr Geology Wonders

Sardonyx is a variety of chalcedony, with is a crystalline quartz. Also known as sardian onyx, it is a blend of sard and onyx.

Sardonyx is a variety of chalcedony, with is a crystalline quartz. Also known as sardian onyx, it is a blend of sard and onyx.

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