Polished Ammonite Fossil
Natural History Specimen / Decorative Stone Sculpture • Nature (Biological organism); Prepped by an anonymous lapidary artisan.
Style & Movement
Natural History / Curio Cabinet Aesthetic.
Medium & Technique
Fossilized cephalopod shell primarily composed of calcium carbonate (calcite/aragonite); mechanically polished and shaped to reveal internal suture lines.
Creation Period
Geological age: Mesozoic Era (Jurassic to Cretaceous periods, approx. 100-200 million years ago); Modern preparation and polishing.
Dimensions & Format
Estimated 15-20 cm in diameter; 3D sculpture in a planispiral (flat spiral) format.
Subject Description
A fossilized ammonite displaying intricate 'suture' patterns. These fractal-like lines mark where the internal chamber walls (septa) met the outer shell. The spiral form represents the growth trajectory of the extinct marine mollusk.
Condition & Value Assessment
Condition Assessment
Good; shows high gloss and well-defined suture patterns, though some natural pitting and surface abrasions are visible near the edges.
Estimated Market Value
$50 - $150 USD
Auction Estimate
$40 - $100 USD
Provenance History
Likely sourced from fossil-rich deposits such as Morocco or Madagascar; purchased through the mineral/gem trade for private collection.
Art Historical Significance
Represents the intersection of natural science and decorative art. Ammonites have historically been called 'Snakestones' in folklore and are prized collectors' items due to their mathematical symmetry and evidence of prehistoric life.
Notable Features
Distinctive complex suture patterns (likely of the Ceratitid or Ammonitid type) and a high-degree polish that enhances the translucent qualities of the mineralized shell.
Condition Issues
Minor surface scratches, natural geological inclusions, and possible stabilization fillers used during the polishing process.
Conservation Recommendations
Keep in a stable temperature environment; dust with a dry, soft fiber cloth; avoid acidic cleaners which could dissolve the calcite surface.