Brilliant structural colors originating from reflection by nanogaps of nacreous layers in fossilized ammonite shells.

Naoki Hizukuri, Yuri Oshima, Yuta Yagi, Hayato Sasazawa, Yuya Oaki, Hiroyuki Tsuda, Hiroaki Imai

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Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

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7 authors.

Naoki HizukuriSchool of Integrated Design Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan.

Yuri OshimaSchool of Integrated Design Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan.

Yuta YagiSchool of Integrated Design Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan.

Hayato SasazawaSchool of Integrated Design Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan.

Yuya OakiSchool of Integrated Design Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan.

Hiroyuki TsudaSchool of Integrated Design Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan.

Hiroaki ImaiSchool of Integrated Design Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan. hiroaki@applc.keio.ac.jp.

Funding

Japan Society for the Promotion of Science JP21H01627

6 · The paper itself

Abstract

Vivid-colored ammonite fossils that are mined in Alberta, Canada, are known as gemstones called "Ammolite." The specific colors having narrow reflectance spectra are ascribed to an interference phenomenon on the preserved nacre of fossils. However, the essence of the vivid tones that are different from the structural coloration of other kinds of shells has not been revealed. In this work, we clarified that specific reflection by interlaminar nanogaps (~ 4 nm) of aragonite plates with the homogeneous lamination period in the fossilized nacreous layers is essential for the emergence of vivid structural colors depending on the thickness of the layer.

Identifiers

PMID41168256

DOI10.1038/s41598-025-21872-z

PMCPMC12575706

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