Fossils.

Preserved biological objects; their mineral composition varies.

Keep each chapter’s scientific identity: a family, species, variety, trade label, rock and fossil are different kinds of names.

Ammonite ↗

Fossil / variable mineral preservation

An ammonite is an extinct cephalopod fossil, not a mineral species. Shell, infill and replacement minerals vary; only some iridescent shell material is sold as ammolite.

Llez (H. Zell). · CC BY-SA 3.0 · Display crop