Beautiful amethyst geode with a rim of colorful agate and an amethyst cave

A Uruguayan amethyst druse with a colorful agate rim and amethyst cave. Outer wall with concentric banding stratigraphy in red, brown, gray, and white, with an open cave inside containing violet crystal points.

The colorful agate rim forms the original geode outer wall. The banding lines document alternating solution phases before the actual amethyst mineralization inside the cavity.

The inner amethyst cave with violet crystal points is the core element. The two-material stratigraphy, agate outside and amethyst inside, is a classic example of geode geology.

Uruguayan amethysts from Artigas and Salto provide this material from the Arapey Basalt Formation. A balanced three-axis geometry for classic display cabinet staging with readability from both sides.