Polychrome Banded Agate Sphere from Brazil - Concentric...

A precious ornamental sphere from Brazil, weighing nearly one kilogram — This fascinating ornamental sphere, deftly worked and polished, was carved from a single block of natural agate of notable quality. The specimen stands out for its exceptional color palette and complex visual composition, the result of the deposition layer by layer of microcrystalline silica over millions of years. The bands, thin and harmonious, unwind across the surface with a hypnotic flow, ranging from warm tones of honey gold and deep orange to delicate lilac and reddish hues, creating a striking contrast with more translucent and gray areas. Each rotation of the sphere reveals new perspectives and details, making it a object of continual visual discovery. The geology of agate, a variety of chalcedony, is intrinsically linked to volcanic activity. It typically forms inside cavities of volcanic rocks, where silica-rich solutions penetrate and deposit successive layers of microscopic crystals. The different colorations are due to the presence of metallic oxides, such as iron, manganese, and titanium, which are incorporated into the crystal structure during growth. This slow and gradual process gives agate its characteristic banding, making each piece unique and unrepeatable. The alternation of transparency and opacity, together with the presence of branched veins and tiny crystalline inclusions, gives depth and a dynamic optical effect to the specimen. Some areas may show natural microfractures or minuscule glistening cavities, which are not defects but authentic signs of the stone’s geological growth process, enriching its charm and history. These intrinsic characteristics testify to the natural origin and the complex formation of the mineral. This sphere represents a collectible piece of great value, ideal for enriching a mineralogical collection, a refined environment, or as a decorative element in a Wunderkammer. Its intrinsic beauty and geological formation make it an object of admiration and contemplation, capable of imparting a sense of natural elegance and harmony to any space. Conditions: The sphere presents natural and excellent condition. Any surface irregularities, small internal fractures, or cavities should be considered part of its geological formation and authenticity, not defects but natural peculiarities of the mineral. Name: Striated Agate; Classification: Mineral; Material: Agate (Chalcedony); Craft: Polished into a sphere; Weight: 953 grams; Dimensions: 88 mm (diameter); Provenance: Brazil; Conditions: Natural, excellent; Lot code: ZAR-181 SAZ-02

估價:$280.32

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