Iridescent Baculite Fossil (Straight Ammonite) This means it forms with

This means it forms with no true crystal structure

it left its mark to be recorded in history

it is possible it is further derived from the Latin word "granum" meaning grain or seed

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nephrite and jadeite

Iridescent Baculite Fossil (Straight Ammonite) This means it forms withSize: 2. 2 x 1. 1 x 0. 6 in. Weight: 1. 6 oz. Here is a fossil that is not often seen in your everyday fossil collection. It is the iridescent shell of a Baculite. This is an extinct cephalopod that lived during the Cretaceous Period. They are related to the more popular ammonite. However, their shells were straight instead of coiled. The shell of aragonite and conchiolin creates thin layers with lots of color play due to interference of light. You