Collector-Grade Amethyst Geode with Galaxy Druzy over CalciteRare Geode with Calcite Covered in Amethyst Elegant and sculptural, this rare amethyst geode features one of the most unusual combinations found in an intact, all natural specimen: beautifully formed calcite covered in amethyst. The result is the kind of piece that instantly stands out in a collection, rare, clean, and genuinely eye catching as a focal point in any space. Here, nature did something truly uncommon. Calcite formed over the chalcedony