Cut & Polished Agatized Ammonite Fossil – 2.10" Display Specimen

Specifications

• Specimen: Agatized ammonite (cut & polished)
• Size: 2.10" across
• Geological Material: Agate, chalcedony, silica-rich mineralization
• Preservation: Internal chambers exposed and polished
• Display: Ready for shelf, desk, or cabinet display
• Condition: Natural mineralization; expertly cut and polished

This specimen represents the fossilized shell of an ancient ammonite, a now-extinct marine cephalopod that thrived in the world’s oceans for over 300 million years. During fossilization, mineral-rich groundwater slowly permeated the hollow chambers of the ammonite’s shell. Over millions of years, silica and other minerals replaced the original aragonite, resulting in the formation of agate, chalcedony, quartz, and sometimes calcite within the chambers.

Cut and polished specimens like this one reveal the original septa (chamber walls), siphuncle paths, and internal structure that once supported the buoyancy system of the living ammonite. The agatization process creates vibrant patterns and textures unique to each fossil, making no two examples alike.

Agatized ammonites are highly valued for both their scientific importance and their decorative beauty, representing the intersection of paleontology, geology, and natural art. This 2.10-inch specimen offers a detailed and visually striking look at fossilization processes that occur underground over extraordinary spans of geological time.