Overview
- The peer-reviewed findings were published in Scientific Reports in 2025 (DOI: 10.1038/s41598-025-21872-z).
- A team led by Hiroaki Imai at Keio University analyzed Alberta specimens using electron microscopy and optical simulations.
- Comparisons with paler Madagascan ammonite nacre and with abalone and nautilus shells revealed similar stacks but differing plate thickness and gap size.
- Brightness correlates with evenly distributed layers of uniform thickness and roughly 4-nanometer air gaps, while larger or missing gaps, organic infill, or irregular layering reduce vibrancy.
- The authors suggest the mechanism could guide durable colorants or optical devices that harness structural interference.