Recumbent amethyst geode with white calcite crystals

A horizontal amethyst geode from Santa Catarina, Brazil with white calcite crystals. The wide, low shape makes the geode's interior visible from multiple angles.

Horizontal geode geometries arise when the geode was lying horizontally in the basalt block and was stabilized in this position after being broken open. The distinctly wide shape opens up the crystal stage like a flat panorama.

The calcite crystals, as a secondary mineralization phase, grew on already formed quartz points after the amethyst growth was complete. White scalenohedral aggregates contrast transparently against the violet amethyst background.

The Santa Catarina deposit provides the highest quality material for such multi-mineral constellations. A Brazilian collector's item with documented two-mineral genesis and gallery dimensions.