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Up for sale is an extraordinary, highly unique collector's specimen: a 7.5 pound museum-grade amethyst geode section boasting an exceptionally high density of pristine white cristobalite orbs and golden-brown goethite inclusions.
This spectacular piece originates from the world-famous deposits of Ametista do Sul, Rio Grande do Sul, Brazil. What makes this particular section a holy grail for mineral collectors is the sheer abundance and dual nature of the cristobalite inclusions. Nearly every single fully formed amethyst crystal point encapsulates at least one white cristobalite orb within its structure, while countless others are beautifully perched on the surface facets.
This combination represents a fascinating thermal paradox. While the vibrant purple amethyst and iron-rich goethite needles formed in a cooling, low-temperature groundwater environment, the cristobalite spheres required a high-temperature hydrothermal "flash" (often exceeding several hundred degrees Celsius) within the ancient Cretaceous volcanic basalt flows. Finding a specimen where these conflicting environments intersected with such high density is incredibly rare.
Specimen Features:
* **Vibrant Color:** Rich, deep purple amethyst crystal points with excellent luster and clean terminations.
* **Cristobalite Orbs:** Dozens of sharp, contrasting white orbs both fully encapsulated inside the crystals and resting on the crystal faces.
* **Goethite Inclusions:** Visible golden-brown acicular sprays and tufts beautifully preserved near the base and within the lower crystal zones.
* **Sturdy Matrix:** Displays a clear, beautifully banded agate base layer transitioning into a rich green basalt/celadonite outer matrix.
* **Impressive Size:** Weighs approximately 7.5 pounds. A standard 16.9 fl oz water bottle is shown in the photos for scale reference.
Whether you are a seasoned mineral enthusiast, a crystal connoisseur, or looking for a jaw-dropping display piece, this high-density inclusion specimen is a phenomenal addition to any collection.
*The item pictured is the exact specimen you will receive. Please review all photos for scale and internal detail.*
Measures 8.5 x 6 x 3.5 inches.
