Exceptionally grown amethyst geode with many small agate eyes

An exceptionally grown amethyst geode from Uruguay, whose outer edge bears several small agate eyes. A rare growth constellation, in which the geode has preserved perfect concentric ring structures at several points of its original agate shell.

Agate eyes form at the geode edge through locally stabilized solution islands, where mineral growth proceeds concentrically around a crystallization nucleus. While the main mass of the geode grew with amethyst points, these islands retained their agate banding.

Multiple agate eyes on a single druse are unusual. They show that the geode's inner wall was structurally heterogeneous, with several parallel micro-channels of growth, making it a didactically valuable piece for mineralogical collections.

Uruguayan amethysts from the Artigas Basin are considered to have the most intense color depth. The geodes are extracted from the basalt flows of the Serra Geral Formation, often requiring several days of mining work.

A collector's item with an instructive multi-core genesis and visual outer-inner tension.