Polycrome Onyx (Travertine) Sphere - Perfectly polished...

Impressive decorative sphere in Calcite Onyx with a concentric pattern and high luster — The specimen up for auction is a meticulously carved and polished sphere of Calcite Onyx, geologically identified as travertine. This mineral is a microcrystalline calcium carbonate form, precipitated from mineral-rich aqueous solutions, typically in contexts of thermal springs or in caves. Its banded structure, evident in this magnificent specimen, is the result of variations in deposition conditions over millennia, creating distinct and complex layers of concentric growth. Analyzing the morphology of this piece, one observes rich polychromy ranging from honeyed and golden tones to deep browns, interspersed with lighter cream and ivory bands. The transparency is remarkable, with semi-translucent areas that allow light to penetrate and reveal the depth of internal stratifications. The bands, both linear and convex, follow in a hypnotic pattern that evokes natural geological stratifications or planetary orbits. The mirror-like polish further enhances the color depth and the intrinsic silken luster of the material. This sphere originates from Mexico, a locality renowned for the extraction of very high-quality calcite onyx, valued for its hardness, workability, and ability to take an excellent polish. The geological formation of this onyx is linked to karst and hydrothermal processes, where underground waters supersaturated with calcium carbonate deposit the mineral in successive layers, thus forming the characteristic bands that make each specimen unique. The artisanal craftsmanship employed in its processing reflects the local tradition in valoriz­ing these telluric gems. Aesthetically, the specimen presents in optimal condition, with a perfectly spherical surface and a glossy finish that maximizes interaction with light. Any microfractures or internal veins should not be considered defects, but intrinsic features of the natural material, testimony to the geological processes that formed it. These details contribute to the piece’s uniqueness, giving it an authentic and unaltered character. With its significant size and weight, this sphere qualifies as a high-quality collectible specimen. It offers a notable visual impact and constitutes a focal point in any display environment, whether a mineral cabinet, a professional studio, or a private residence. Its timeless elegance and distinctive character make it ideal for collectors, geology enthusiasts, and design aficionados, or anyone wishing to own a piece of natural history transformed into a work of art. It compares favorably to museum specimens for the clarity of the bands and the quality of the polish.

Estimation:€300

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