fossil

Petrified Wood

Silicified wood (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, varying colors of brown, grey, and red, with a vitreous to dull luster.

Identified October 23, 2026More fossil →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, varying colors of brown, grey, and red, with a vitreous to dull luster.

Formed when buried vegetation is slowly replaced by minerals like silica-rich groundwater over millions of years.

Used primarily in lapidary arts, decorative items, jewelry making, and as collector specimens.

Petrified wood retains the original cellular structure of the tree while completely turning into solid quartz.

Identify by retaining wood grain textures combined with conchoidal fracturing and high hardness.

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)