• Location: Namibia
• Weight: 1.7g
• Size: 1.6 x 1 x 0.5 cm
• DETAILED DESCRIPTION

Zonal amethyst – quartz with a characteristic banded structure

Zonal amethyst is a variety of amethyst characterized by alternating color zones within a single crystal. Typical is the combination of purple, clear, or milky bands, which form due to variations in conditions during crystal growth. These zones can be subtle or strongly contrasting, creating a characteristic banded pattern.

Appearance and processing

Zonal amethyst is often cut into cabochons or faceted stones; the type of cut influences the final appearance of the pattern. In cabochons, soft color transitions stand out, while faceted stones emphasize the contrast between different zones. Each piece is unique due to its internal structure.

Formation of zonal amethyst

Amethyst forms through crystallization from mineral solutions within rock cavities. The zonal structure develops due to fluctuations in chemical conditions, particularly iron content and radiation intensity during crystal growth. These changes are recorded in the mineral structure as individual color layers.

Amethyst deposits

Zonal amethysts are found in many locations around the world, especially in Brazil, Uruguay, Namibia, Russia, and Madagascar. Each location produces material with different types of banding and color intensity.

Properties and characteristics

Zonal amethyst has a hardness of 7 on the Mohs scale, is transparent to translucent, and exhibits a vitreous luster. Its typical characteristic is internal zoning, which influences both its appearance and how it is processed. Thanks to its durability, it is suitable for use in jewelry.