Huge, slightly heart-shaped dark amethyst geode with a large, clear yellow calcite crystal

A heart-shaped dark amethyst geode from Uruguay with a large clear yellow calcite crystal. An architectural gallery presentation in a rare three-feature constellation.

Uruguayan amethyst crystallizes in volcanic geodes of the Arapey Basalt Formation. The heart-shaped geode geometry is a form variation due to its discovery. Distinct heart shapes arise from specific fracture lines in the surrounding basalt.

The yellow calcite crystal is a secondary mineralization phase. It grew on already formed quartz points after the amethyst growth was complete. Iron substitutions color the calcite yellow. Clear yellow calcites of block size are a premium collector's detail.

The combination of dark premium color, heart-shaped geometry, and large yellow calcite is rare worldwide in this block size. The Uruguayan deposits in Artigas and Salto supply this premium material.

A museum-quality Uruguayan collector's item with a three-feature constellation and museum gallery dimensions.