fossil

Petrified Wood

Silicified wood (SiO2)

Hardness of 7 on the Mohs scale; displays wood grain patterns with vitreous to waxy luster; colors range from brown and grey to multicolored.

Identified November 2, 2026More fossil →

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Physical properties

Hardness of 7 on the Mohs scale; displays wood grain patterns with vitreous to waxy luster; colors range from brown and grey to multicolored.

Formed via permineralization, where organic wood material is completely replaced by minerals like quartz over millions of years.

Used in decorative carvings, lapidary art, high-end jewelry, and as valuable geological specimens for collectors.

The petrification process preserves the original cellular structure of the ancient wood down to microscopic details.

Identify by its external woody texture combined with a stone-like weight and ring; commonly found in sedimentary rock layers worldwide.

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