Rock Identifier
Fossilized Coral (Rugosa or Tabulata coral fossil) — fossil
fossil

Fossilized Coral

Rugosa or Tabulata coral fossil

AI-generated identification · may be incorrect

Hardness of 3 to 4 on the Mohs scale, typically buff, tan, or grey in color with a dull to earthy luster, exhibiting distinct colonial calices or internal corallite structures.

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Physical properties

Hardness of 3 to 4 on the Mohs scale, typically buff, tan, or grey in color with a dull to earthy luster, exhibiting distinct colonial calices or internal corallite structures.

Formation & geological history

Formed in ancient shallow marine environments during the Paleozoic era when silica or calcite replaced the original organic coral skeletons over millions of years.

Uses & applications

Used primarily as decorative lapidary material, educational specimens, and in fossil collecting.

Geological facts

Many fossil corals are state stones, and their preservation often allows scientists to study ancient marine ecosystems and climate conditions from hundreds of millions of years ago.

Field identification & locations

Identify by characteristic honeycomb or star-shaped coral structures embedded in sedimentary rock formations, commonly found in limestone-rich regions worldwide.

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Fossilized bivalve shell; exact species cannot be identified from the image

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Crinoid Stem Fossil in Matrix (Phylum Echinodermata, Class Crinoidea) — fossil

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

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Fossiliferous limestone (likely a crinoidal or shell-fragment limestone) (Bioclastic limestone, composed chiefly of calcite (CaCO₃)) — sedimentary

Fossiliferous limestone (likely a crinoidal or shell-fragment limestone)

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

sedimentary
Porous limestone pebble (Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image) — sedimentary

Porous limestone pebble

Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image

sedimentary
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Weathered fossil bone fragment (identification uncertain)

Fossilized bone; exact taxon and mineral composition cannot be determined from the image

fossil