Agate / Crystal Geode

Grey cupped halves face each other, each with a dark, glittering window.

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. Cut pair of grey-banded halves turned inward, each with a smooth, curved wall and a squared pocket of dark sparkling grains. The outside is a rough pale crust. Both faces have a glassy polish. It is 4 inches wide, 3.5 deep and 3.25 high.

A pair with plenty to say to each other.