large flat amethyst geode with calcite crystals and stalactites with agate eyes and agate flowers

A large, flat amethyst geode from Brazil, Santa Catarina with calcite crystals, stalactites, agate eyes, and agate flowers. Four mineral phases are openly displayed in a single geode shell; the flat geometry makes all layers of detail visible simultaneously.

Agate eyes are concentric micro-bands from the first solution phase. Agate flowers appear as radial aggregates. The main amethyst phase then fills the geode volume with purple tips.

Calcite grew as a later phase on already formed quartz tips, often as a contrasting white accent. Such geodes are paleogeological documents: each mineral zone corresponds to a geochemical phase in geode growth.

The Santa Catarina deposit in Brazil provides the highest quality material for these multi-mineral constellations. Four-mineral exposures in one geode are rare.

A Brazilian collector's item of architectural gallery dimension with four-mineral genesis and documented Santa Catarina provenance.