GEODORA demonstration collection. Photographs are representative and do not depict the same individual specimens as the 3D models.

ammonite.png: Angeleses / Pixabay. Public domain. Source: https://snl.no/fossiler
ammonite.glb: Ringsteadia anglica (Ammonite), BIRUG 50264, Lapworth Museum of Geology. Scan: Courtney Szanto, Artec Spider. Oxfordian, Jurassic. https://zenodo.org/records/10311939 . CC BY-NC 1.0 https://creativecommons.org/licenses/by-nc/1.0/ . Mesh simplified and texture resized for web delivery. Noncommercial demonstration.
quartz.jpg: Yamanashi Gem Museum, https://www.gemmuseum.jp/photos/ . Original: https://www.gemmuseum.jp/img/r_quartz.jpg . Photo collection authorizes free personal and commercial use.
quartz.glb: Star-shaped quartz. Geological Museum, Polish Academy of Sciences. Digitization RDW MIC. CC0. https://zenodo.org/records/21530505
model-viewer.min.js: @google/model-viewer 4.1.0. Apache-2.0. https://github.com/google/model-viewer

belemnite-cutout.png: AI background extraction from Rhetos CC0 photo https://commons.wikimedia.org/wiki/File:Belemnit_(Donnerkeil,_Senserbach).jpg . Illustrative demonstration, not a scientific image.