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Stones - Agate/Onyx - Fossil

Fossil agate is a general term for instances where various types of agate have formed as mineral replacements in fossilization. While some specimens are extraordinary, many are just concretions of small shells that form an interesting marble-like pattern. You can often pick out the shapes of different shells in large chunks. The concretions are sometimes cut for jewelry.

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Stones - Agate/Onyx - Fossil

Stones - Agate/Onyx - Fossil

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Agatized ammonite

coral fossil

Agatized coral, aka fossil agate.

Cushion cut rectangle of fossil agate

Fossil agate sphere. This one is a fossil of coral, rather than a shell concretion.

Huge 4.3" Bug Fossil Agate Sphere, Crystal Ball

Oval cabochon of fossil agate. Shell forms can clearly be seen in this specimen.

Fossil Agate carving of skull.

Rare 2.3" Bug Fossil Agate Carved Crystal Skull, Realistic

Faceted barrel beads cut from fossil agate. Small specimens like this often show interesting patterns, but distinct fossil shapes are not common.

Oval cabochon cut from agatized fossil palm.

Spheres of fossil agate.