fossil

Polished ammonite fossil pendant

Ammonite; likely a polished, mineral-replaced ammonoid shell (commonly Calcite or Aragonite)

AI-generated identification · may be incorrect

Planispiral chambered shell with dark brown to amber mottling and visible septa; polished glossy luster. Original shell minerals are commonly replaced by calcite, aragonite, or silica; hardness typically 3–7 depending on preservation.

Identified August 27, 2026More fossil →

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Physical properties

Formation & geological history

Ammonoids were marine cephalopods that lived from the Devonian to the end-Cretaceous, becoming extinct about 66 million years ago. Their shells accumulated in marine sediments and were later fossilized through mineral replacement and compaction.

Uses & applications

Used as jewelry, ornamental objects, and fossil collectibles; not typically used industrially or in construction.

Geological facts

The coiled pattern reflects a chambered shell, while the internal dividing walls may produce distinctive suture lines. The pendant appears cut and polished, with a drilled or mounted edge for suspension.

Field identification & locations

Identify by the continuous spiral, chamber divisions, and fossil texture rather than random mineral banding; common sources include Madagascar, Morocco, Alberta, and the United Kingdom. Avoid acids and harsh heat, especially if calcitic.