fossil

Olive Shell

Oliva sp. (Calcium Carbonate, CaCO3)

Hardness of 3-4 on Mohs scale, glossy vitreous luster, smooth cylindrical shape, and intricate brown and white patterning.

Identified November 10, 2026More fossil →

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Physical properties

Hardness of 3-4 on Mohs scale, glossy vitreous luster, smooth cylindrical shape, and intricate brown and white patterning.

Formed organically by marine gastropods in tropical and subtropical shallow sandy ocean environments spanning recent to ancient geological epochs.

Used in shellcraft, traditional jewelry, and as collectible specimens for beachcombers.

Olive shells were historically used as a form of currency and traded extensively across ancient indigenous trade routes.

Easily identified by their glossy, streamlined cylindrical shape and narrow aperture, commonly found washed ashore on sandy tropical beaches.

Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

Likely fossil oyster shell

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

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

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

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

Porous limestone pebble

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

Fossil oyster shell

Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)