Natural-Back Cornucopia Amethyst Geode – Minas Gerais, Brazil – 65 lbs

A monumental Natural-Back Cornucopia Amethyst Geode from Minas Gerais, Brazil, weighing approximately 65 pounds and featuring a large, deeply crystallized interior chamber. Its unusual freestanding silhouette rises into a naturally pointed upper termination, giving the formation the appearance of a mineral cornucopia, crystal cave, or sculptural cathedral.

The open display face reveals hundreds of quartz and amethyst crystals extending throughout the chamber. Pale lavender coloration is concentrated around the inner walls and deeper recesses, where closely intergrown crystal points create considerable depth and sparkle. Larger crystals project inward from the sides and lower ledge, while densely crystallized surfaces continue into the shadowed interior.

A substantial border of colorless-to-milky quartz surrounds the amethyst chamber. This thick quartz frame transitions gradually into lavender crystal growth, documenting multiple stages of silica crystallization within the original volcanic cavity. Under direct lighting, the many reflective crystal faces produce bright flashes and subtle rainbow reflections.

The exterior retains its natural dark volcanic back rather than being covered or reconstructed. Areas of earthy brown, charcoal black, and naturally occurring green mineral staining remain visible across the reverse and sides, preserving the geological character of the original host rock. The contrast between the rugged natural exterior and brilliant crystallized interior gives the specimen two dramatically different appearances.

Measuring approximately 14 × 16 × 13.5 inches and weighing 65 pounds, this is a genuine statement-sized mineral display. Its substantial mass, broad crystal chamber, unusual pointed silhouette, natural exterior, and freestanding presentation make it ideally suited for a serious mineral collection, luxury interior, office, gallery, showroom, or hospitality display.

Specifications

Mineral: Amethyst Quartz

Formation: Large open geode with a cornucopia-shaped profile and pointed upper termination

Locality: Minas Gerais, Brazil

Weight: Approximately 65 lbs (29.5 kg)

Dimensions: Approximately 14 × 16 × 13.5 inches

Color: Colorless and milky white quartz transitioning into pale lavender amethyst

Crystal Habit: Densely intergrown prismatic quartz crystals with pointed terminations

Luster: Vitreous to glass-like

Transparency: Transparent to translucent crystal points with milky quartz areas

Crystal System: Trigonal

Chemical Composition: SiO₂

Exterior: Natural dark volcanic host rock with earthy and green mineral staining

Face: Cut and finished to expose the natural crystal chamber

Back: Natural and substantially unaltered

Display: Naturally freestanding statement specimen

Condition: Natural mineral specimen with inherent contacts, crystal irregularities, inclusions, internal fractures, mineral staining, and variations associated with extraction and preparation

Exact specimen shown

About Brazilian Amethyst Geodes

Amethyst is the purple variety of quartz. Its coloration develops when trace iron incorporated into the quartz structure is affected by natural geological irradiation. Color can range from extremely pale lilac to deep violet and may vary considerably within a single geode.

Brazilian amethyst geodes formed inside cavities in ancient volcanic rock. Silica-rich fluids entered these openings and gradually deposited layers of chalcedony, quartz, and amethyst. Repeated mineralization produced the thick white quartz border and inward-facing crystal chamber visible in this specimen.

The dark natural exterior represents the original volcanic host material surrounding the cavity. Its preservation helps illustrate the dramatic difference between the geode’s rugged exterior and its crystallized interior.

Minas Gerais is among Brazil’s best-known mineral-producing regions and has supplied the collector market with amethyst, quartz, tourmaline, topaz, and many other important mineral species.

Collector Notes

This specimen features:

• Monumental 65-pound statement size
• Natural amethyst and quartz from Brazil
• Unusual cornucopia or crystal-cave silhouette
• Naturally pointed upper termination
• Large, deeply recessed crystal chamber
• Hundreds of visible quartz and amethyst points
• Pale lavender coloration concentrated toward the interior
• Substantial milky and colorless quartz border
• Larger projecting crystals among dense smaller growth
• Bright vitreous sparkle and reflective crystal faces
• Natural dark volcanic exterior
• Preserved earthy and green mineral staining
• Strong contrast between rugged back and crystallized face
• Naturally freestanding presentation
• Excellent architectural and interior-design presence
• One-of-a-kind natural formation
• Exact specimen pictured

Perfect for collectors of Brazilian amethyst, large geodes, natural-back specimens, amethyst cathedrals, statement minerals, quartz caves, geological décor, gallery minerals, luxury office displays, and substantial natural-history specimens.

Due to its exceptional size and weight, this specimen requires special handling and protective packaging. Please verify delivery arrangements before purchase.

Professionally packaged and shipped from Colorado.

You will receive the exact specimen shown.

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