Great amethyst heart with large crystals in a metal stand

An amethyst heart with large crystals in a metal stand from Brazil. The unusually large internal crystals document a particularly calm geode growth phase with long-lasting stable solution chemistry.

Large-crystal amethysts are a collector's classification of their own. Crystal size is a function of growth duration: long stable phases produce a few large crystals, turbulent phases produce many small ones. Pieces with large crystals mineralogically document calm deposit histories.

The heart-shaped cut exterior frames the large-crystal internal anatomy. When directly illuminated, the few large crystal facets reflect coherently, unlike the diffusely reflecting multitude of small crystals in standard geodes.

The metal stand fixes the heart composition in a vertical viewing position.

A Brazilian collector's item with large-crystal internal anatomy and heart-shaped composite classification.