fossil

Petrified Wood

Silicified Wood / Fossilized Xylite

Hardness of 7 on the Mohs scale, variable earth-tone colors, vitreous to dull luster, cryptocrystalline quartz structure, specific gravity 2.5-2.7.

Identified November 15, 2026More fossil →

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Physical properties

Hardness of 7 on the Mohs scale, variable earth-tone colors, vitreous to dull luster, cryptocrystalline quartz structure, specific gravity 2.5-2.7.

Formed through permineralization when buried organic wood is slowly replaced by silica-rich groundwater over millions of years.

Used in decorative items, lapidary arts, high-end furniture, jewelry, and prized by fossil collectors.

The organic cellular structure of the original tree is often perfectly preserved down to microscopic growth rings.

Identified by its preserved wood grain texture combined with a stone-like weight and hardness; found worldwide in sedimentary strata.

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

Fossil

Invertebrate fossil / Trace fossil

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