November 20, 2012

Rocks with Sparkle: How Do Geodes Form?

Kate Baggaley, Scienceline


iRocks.com/Wiki Commons

Geodes are irresistible. They fill display cases and museums everywhere. I’ve even got one on my desk at home: a smooth, brownish rock encasing milky lavender crystals. It’s hard to deny the allure of a rock that is rugged and weathered on the outside, yet so sparkly and colorful on the inside.

But where do geodes actually come from?

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TAGGED: Crystals, Geodes, Rocks