Agate / Crystal Geode

Small flat oval beside a larger rough-edged one, each with a grey sparkle pocket.

This is an agate and crystal geode. A geode is a hollow rock lined with mineral crystals, and it forms when mineral-bearing water slowly deposits material inside a cavity over a very long time. Two halves with smooth bands of brown, slate blue and white around a small hollow of fine grey grains. The right half is broader, with a dark brown ring and a crumbly yellow crust along its lower edge. It is 5 inches wide, 3.5 deep and 2.75 high.

Layered like a good story, and equally quiet about it.