Rock Identifier
Conical fossil shell or shell fragment (Likely a gastropod shell fragment; exact taxon indeterminate from the image) — fossil
fossil

Conical fossil shell or shell fragment

Likely a gastropod shell fragment; exact taxon indeterminate from the image

AI-generated identification · may be incorrect

Small tapered, conical brown specimen with a hollow interior and likely layered, slightly lustrous shell material. Original shell aragonite or calcite; hardness about 3–4 Mohs, though fossilization may alter composition.

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Physical properties

Small tapered, conical brown specimen with a hollow interior and likely layered, slightly lustrous shell material. Original shell aragonite or calcite; hardness about 3–4 Mohs, though fossilization may alter composition.

Formation & geological history

Probably a marine mollusk shell or fragment, formed biologically and later buried in sediment; geological age cannot be determined visually and may range from recent to Paleozoic.

Uses & applications

Primarily a teaching or collectible specimen; fossil shells are also used in jewelry and decorative crafts when stable and sufficiently attractive.

Geological facts

The visible cavity and conical coiling suggest a gastropod rather than an igneous or metamorphic rock, but the image is insufficient to distinguish a fossil from a modern shell fragment.

Field identification & locations

Look for spiral growth lines, aperture shape, nacre, and mineral replacement; common sources include marine sedimentary deposits and beaches. A hand lens and acid test by a specialist can help distinguish carbonate shell from other materials.

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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)

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Rounded sedimentary pebble

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