Beautiful dark amethyst geode pair from Brazil

A dark amethyst geode pair from Brazil in a compact collector's size. The deep violet color is a marker for geodes with increased iron concentration during crystallization.

Amethyst forms in volcanic geodes of the Serra Geral Basalt Formation from silica-rich solutions that slowly crystallized in the cavities over millions of years. The violet color results from the interaction of trace iron elements with natural radiation exposure.

Brazil supplies amethyst in a wide color palette, from light lilac to deep violet. Dark geodes like this are not as common as the light pastel varieties and are classified accordingly higher in the collector's trade.

The geode pair presentation is a curated arrangement of the two halves that originally formed the closed geode together. Arranged mirror-symmetrically, they once again clearly show the original growth symmetry.

A collector's item with classic form and Brazilian color depth.