Rare amethyst geode pair with two chambers

A rare amethyst geode pair from Brazil with two separate chambers within a single geode. A morphologically unusual constellation.

Two-chamber geodes form when two crystallization centers grow in parallel within a geode. They remain separated by an intermediate wall of agate or quartz. The subsequent splitting exposes both cavities simultaneously.

Amethyst crystallizes in volcanic geodes of the Serra Geral basalt formation from silica-rich solutions over millions of years. The Brazilian deposits in Rio Grande do Sul supply the material. The second chamber is a rarity due to its discovery, found in only a small fraction of geodes.

The double-chamber geometry is the collector's value of this piece. Two amethyst cavities in a single geode document a complex growth history and belong to the premium classification.

A collector's item with unusual geode morphology and Brazilian provenance, suitable for display in a showcase with a focus on the double-chamber detail.