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Two pieces of agate geode

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17g 4h 14m 59s
13/11/2026 15:05:00
Estimate
€ 200,00 / 400,00
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Description

Two pieces of agate geode

SiO₂ (chalcedony/agate) — fibrous microcrystalline structure
More information
Typically sourced from Brazil, Uruguay, Morocco, and Madagascar, these are cut and polished sections of geodes containing agate—a microcrystalline variety of quartz—deposited in concentric bands within volcanic cavities through the cyclic precipitation of colloidal silica colored by metal oxides.

Widely used for bookends, coasters, and decorative items; prized by collectors for its endless variety of patterns; sometimes artificially dyed to intensify the colors.
Time auction 1251

Historia Naturalis

mon 26 October - fri 13 November 2026
The description sheets do not always indicate the state of conservation of the goods, we invite you to always request the condition report before making your offers
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