This specimen has been sold.
This fossil is displayed as part of our archive of previously sold specimens. Browse our current Ammonite collection to see what’s available.
This authentic cut and polished black agatized ammonite fossil measures 2.24" across and showcases beautifully preserved internal chambers filled with agate and silica-based mineralization. Expertly prepared, this specimen reveals the intricate internal structure of an ancient ammonite shell, making it an excellent choice for collectors and display.
Agatized ammonites form when mineral-rich groundwater slowly replaces the original shell material over millions of years, resulting in vibrant patterns and crystal-filled chambers. No two specimens are ever alike, giving each fossil its own unique appearance and character.
Item Specifics
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Specimen: Black Agatized ammonite (cut & polished)
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Size: 2.24" across
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Geological Material: Agate, chalcedony, silica-rich mineralization
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Preservation: Internal chambers exposed and polished
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Display: Ready for shelf, desk, or cabinet display
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Condition: Natural mineralization; expertly cut and polished
About This Specimen
This cut and polished ammonite fossil reveals the original septa (chamber walls), siphuncle pathways, and internal buoyancy structures that once allowed the living ammonite to navigate ancient oceans. The polishing process enhances the natural agate and crystal textures, creating a visually striking cross-section of prehistoric marine life.
Agatized ammonites are highly sought after for both their scientific significance and decorative appeal, bridging paleontology, geology, and natural art.
About Ammonites
Ammonites were extinct marine cephalopods related to modern squid and octopus that thrived in Earth’s oceans for over 300 million years. Their spiral shells grew in chambers as the animal matured, leaving behind a detailed record of growth and environmental conditions.
Through fossilization, silica and other minerals replaced the original shell material, forming agatized ammonites that preserve stunning internal structures rarely seen in nature.
Why Collect Cut & Polished Ammonites
- Genuine agatized ammonite fossil
- Cut and polished to reveal internal chambers
- Unique crystal and agate mineralization
- Excellent for display, education, or décor
- Each specimen is one-of-a-kind in pattern and color
- Memorable gift for fossil and natural history enthusiasts
Why Buy from Fossil Driven
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100% authentic fossils — no replicas
- Carefully selected display-quality specimens
- Clear, accurate photography of each item
- Fast, secure shipping
- Small, enthusiast-owned business passionate about fossils
Explore More Fossil Collections
Final Notes
Add this authentic cut and polished agatized ammonite fossil to your collection and own a natural work of art formed over millions of years beneath ancient seas. Every Fossil Driven specimen is genuine fossil material, carefully prepared and ready to be displayed.
— Brandon Zulli & the Fossil Driven Team
