Ammonite — Polished Section — Small Specimen

$69.78
Chemical FormulaAragonite/calcite shell
Crystal System
Mohs Hardness
Specific Gravity
Luster
Transparency

Cut and polished, an ammonite’s internal chambers reveal the logarithmic spiral that mathematicians called the ‘golden ratio’ centuries before they understood its name. The iridesc…

27 in stock

SKU: TC-FOS-0571
Category:
Tags: , ,

Description

The universe has 13.8 billion years of history. Some of it fits in your hand. Cut and polished, an ammonite’s internal chambers reveal the logarithmic spiral that mathematicians called the ‘golden ratio’ centuries before they understood its name. The iridescent nacreous layer — preserved aragonite from the original shell — creates colors that shift with viewing angle. These Cretaceous cephalopods died 66 million years ago; their shells are more beautiful than they could have imagined.

This specimen originates from Mahajanga Province, Madagascar, one of the world’s most significant localities for this type of material. Collectors and scientists have drawn from this region for generations, and for good reason: the combination of geological conditions here produces specimens of exceptional quality and clarity.

Every specimen is unique. Photographs approximate the visual experience, but the real thing — its weight, its luster under a raking light, the way it catches the corner of your eye — can only be experienced directly.

Formation

Fossilization is a rare event: fewer than 1 in 10,000 organisms ever become fossils, and even fewer survive to be collected. This specimen represents a successful preservation — chemistry, burial, and geological luck combining to maintain structural detail across millions of years.

Locality

Ammonite — Polished Section — Small Specimen from Mahajanga Province, Madagascar. This locality is known for producing specimens of exceptional quality.

Collector Notes

The luster is maximized by low-angle raking light — try a single spotlight.