AMETHYST – Bifacial 37cm Cluster, Purple Crystals, Minas Gerais, Brazil

This exceptional Amethyst specimen hails from the famous gem-producing state of Minas Gerais, Brazil, one of the world's most important sources of natural amethyst. The piece is entirely natural and untreated, showcasing the deep, saturated violet color that has made Brazilian amethyst prized by collectors for generations.

What sets this specimen apart is its unusual bifacial crystallization: rather than displaying crystal growth on a single face attached to a matrix, this piece has developed well-formed amethyst crystals on both sides. This double-sided growth creates a sculptural, almost floating presence, allowing the specimen to be appreciated and displayed from multiple angles — a feature that is far less common than the typical single-face crystal plates usually seen on the market.

The individual crystal faces are sharply defined, with a harmonious, even growth pattern across the surface that speaks to a stable, undisturbed formation environment within the host rock cavity. The intense violet coloration is vivid and consistent across the piece, with the natural play of light across the crystal faces enhancing the depth of color when the specimen is properly illuminated.

Amethyst deposits in Minas Gerais are hosted within volcanic basalt formations, where large cavities and geodes provide the space for slow crystal growth over geological time. Mining in the region remains active today, with both artisanal and mechanized operations continuing to supply the global market, though pieces combining this size with genuine bifacial crystallization are considerably less frequently encountered than standard single-face specimens.

At over 37 cm across and weighing nearly 3.7 kg, this is a substantial museum-class piece, ideally suited to anchor a high-level mineralogical collection or serve as a bold decorative centerpiece in an exclusive interior setting.

Amethyst is the violet variety of quartz, and its distinctive purple color is caused by trace amounts of iron (Fe) substituting within the silicon dioxide crystal lattice, combined with natural irradiation received over geological time. This irradiation alters the oxidation state of the iron impurities, creating color centers responsible for the violet hue; the intensity of the color can vary depending on the concentration of iron and the degree of natural radiation exposure at the deposit.

This specimen displays an unusual bifacial crystal growth, with well-formed crystal faces developed on both sides of the piece rather than on a single face attached to a matrix. This kind of double-sided crystallization typically occurs when a crystal-lined cavity fractures naturally along an internal plane, exposing crystallized surfaces on what were originally two opposing faces of the same geode pocket.

Amethyst from Minas Gerais forms within cavities and geodes in volcanic basalt rock, where silica-rich hydrothermal fluids slowly deposited quartz crystals over long geological periods. Mining in the region remains active today, combining artisanal extraction with more mechanized operations.

• Formula: SiO₂ (Silicon Dioxide)
• Key chemical elements: Silicon, Oxygen, trace Iron
• Hardness (Mohs scale): 7
• Mineral class: Silicates (Tectosilicates)
• Crystal system: Trigonal
• Crystal habit: Prismatic, crystal cluster with bifacial growth
• Formation: Hydrothermal deposition within volcanic basalt cavities and geodes
• Color: Intense violet-purple, caused by iron impurities and natural irradiation
• Locality status: Active mining region
• Special features: Rare bifacial crystallization with well-formed crystal faces on both sides

The name "amethyst" derives from the ancient Greek word "amethystos," meaning "not intoxicated" — the stone was historically believed by the Greeks and Romans to protect its wearer from drunkenness, and wine goblets were sometimes carved from it.

Until large deposits were discovered in Brazil during the 19th century, amethyst was considered a cardinal gem, ranked alongside diamond, ruby, sapphire, and emerald in value. Only after Brazilian and Uruguayan sources began large-scale production did amethyst become more widely available and affordable.

Minas Gerais remains one of the most prolific amethyst-producing regions on the planet, with active mines still extracting geodes from ancient volcanic basalt flows today, continuing a mining tradition that has shaped the local economy for well over a century.

In crystal healing traditions, Amethyst is regarded as one of the most powerful stones for calming the mind and promoting spiritual awareness. It is said to help dissipate anger, fear, and anxiety, encouraging emotional balance and inner peace. Amethyst is also associated with enhancing intuition, meditation, and restful sleep, and is often used to create a protective, soothing energy within a space.

A piece with crystallization on both sides, such as this one, is sometimes considered by practitioners to radiate energy more evenly in all directions, making it a popular choice for placement in the center of a room or meditation space rather than against a wall.

Please note that these interpretations are not scientifically proven.

Photos: All photographs are taken under professional lighting conditions to accurately highlight crystal structure, color and detail. However, slight variations in tone and appearance may occur depending on screen calibration and ambient lighting conditions.

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Multiple purchases can be consolidated into a single shipment, including items from different auctions or separate orders, by simply contacting us to arrange combined shipping. For high-value specimens, direct delivery by appointment is also available, either at home or at major European mineral shows and fairs.