Great Uruguay amethyst geode with luminous crystals

A natural amethyst geode from Uruguay with dark, well-formed crystals and a wide rim of rock crystal and brownish-green agate. The host rock on the back is basalt.

The typically darker violet tones of Uruguayan geodes result from a specific trace element constellation in the basaltic host rocks of the Paraná Province. These deposits are considered the best source for deep violet amethyst quality.

The polished rim contrasts with the unworked, glittering crystals inside. The geode formed about 100 million years ago as a gas bubble in flowing lava. A mineralogically clear display geode with documented premium coloring.