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Barnebys HQ
Brahegatan 10
BOX 5038
114 37 Stockholm
All auctions / Ethnographical / Banded Agate Sphere - Captivating Azure and Whitish Blue...
Polished specimen with concentric formations — This magnificent banded Agate sphere, originating from Brazil, is a classic example of microcrystalline quartz, characterized by thin parallel bands that document the variations in geochemical conditions during its formation. The internal structure reveals layers of chalcedony and microcrystalline quartz deposited in volcanic cavities. Visual analysis of the sphere reveals a complex chromatic stratification. Predominant are pale blue-gray and milky white tones, which alternate with precision to form distinctive concentric patterns. Some sections of the sphere display 'eyes' or 'bull's-eye' formations, indicators of centripetal crystallization inside spherical geodes. The glossy finish enhances the translucency of the material, allowing light to interact with the bands and reveal the depth of the colors. Although the Provenance is indicated as 'Brazil', a prolific source of high-quality agates, the chromatic and structural characteristics suggest extraction from specific deposits known for agates with these particular bands and formations. The tinting, though not explicitly stated in the provided data but sometimes common in blue-intense agates to enhance the chroma, does not diminish the intrinsic value of the stone's natural formation. From an aesthetic standpoint, this specimen stands out for its perfect symmetry and flawless polish, making it a collector's piece of notable visual impact. Inclusions are minimal and do not alter the overall beauty or structural integrity of the sphere. The color transitions are fluid and well defined, offering a surface that invites visual exploration. The state of conservation is excellent, as indicated by the data provided ('Good'), with no evidence of chipping, cracks, or significant surface abrasions. The absence of a support in the description implies that the sphere could be displayed on a base of the collector's choosing, allowing full rotation to admire every angle of its intricate formations. This piece represents an opportunity for collectors who appreciate gems worked with masterful craftsmanship. Its combination of mass, dimensions and intrinsic banded formations makes it a superior specimen compared to many common agate spheres. Its geological nature and craftsmanship make it an object of mineralogical study and a highly valued aesthetic element.
Estimate:£127.23
Sold for:-
View all items fromCatawikiorEthnographical
Hammer price:
-
Estimate:
£127.23
OCT 17 | 10:00 PM
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Two gilded bronze Singha temple lions, Thailand, first half of the 20th century
10/07/2026
£186.47
Est: £170.79
