Geode

From Wikipedia:
Geodes (Greek γεώδης - jē-ōds, "earthlike") are geological rock formations which occur in sedimentary and certain volcanic rocks. Geodes are essentially rock cavities or vugs with internal crystal formations or concentric banding. The exterior of the most common geodes is generally limestone or a related rock, while the interior contains quartz crystals and/or chalcedony deposits. Other geodes are completely filled with crystal, being solid all the way through. These types of geodes are called nodules.

The boys were gifted with a geode this week from our good friend Diane. We started in the kitchen inside a cardboard box on a wooden cutting board. I quickly realized the place to crack this puppy was going to be outside.

The boys took turns for a while and then I gave it a few whacks. Eventually, we got it open.Nice, huh? Thank you Dianey!