fossil

Fossilized Wood

Petrified Wood (Silicified Wood)

Hardness of 7 on the Mohs scale, varied multicolored hues, vitreous to waxy luster, and cryptocrystalline quartz structure.

Identified November 10, 2026More fossil →

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Physical properties

Hardness of 7 on the Mohs scale, varied multicolored hues, vitreous to waxy luster, and cryptocrystalline quartz structure.

Formed when buried organic wood is slowly replaced by minerals like silica under anaerobic conditions over millions of years.

Used in ornamental carvings, decorative tabletops, lapidary art, and sought after by fossil and mineral collectors.

The organic material is completely replaced by stone while retaining the original cellular structure of the tree.

Identify by retaining tree growth rings and bark texture while possessing an exceptionally high density and stony weight.

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