Buy Rainbow Amethyst Cluster Geode with Calcite - 7cm, 235g

This extraordinary rainbow amethyst with calcite is a rare and precious piece, especially in this delicate pastel shade. The pink hues make it a unique collector's item.

Formation: Amethyst is a variety of quartz and forms in volcanic rock cavities rich in silicon dioxide. Through hydrothermal processes, the silicon dioxide crystallizes in these cavities, creating beautiful amethyst crystals. The characteristic purple color of amethyst is caused by trace amounts of iron and natural radiation effects.

In some amethysts, like this one, calcite crystals can form. Calcite often develops in cavities and cracks of the host rock and adds additional aesthetic and mineralogical variety to the amethyst. The combination of these two minerals is rare and especially fascinating, as the calcite forms a beautiful complement to the purple and pink tones of the amethyst.

The rainbow effect in amethysts arises from natural cracks and inclusions in the crystal that refract and reflect light, resulting in a shimmering play of colors. These special crystal formations, which resemble flowers, form through the even and slow layering of quartz layers, often influenced by temperature changes and the chemical makeup of the surrounding water.