fossil

Petrified Wood

Silicified wood (permineralized organic tissue)

Hardness of 6.5 to 7 on the Mohs scale, variable earth-tone colors, vitreous to waxy luster, amorphous crystal structure, conchoidal fracture.

Identified November 2, 2026More fossil →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, variable earth-tone colors, vitreous to waxy luster, amorphous crystal structure, conchoidal fracture.

Formed over millions of years when buried tree material is saturated with mineral-rich groundwater, replacing organic matter with silica.

Used primarily in lapidary arts, decorative items, bookends, and jewelry making.

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

Identify by distinctive wood grain patterns combined with a stone-like weight and hardness; found worldwide in sedimentary rock layers.

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

Weathered fossil bone fragment (identification uncertain)

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