fossil

Polished fossilized wood (likely petrified wood)

Silicified wood; primarily quartz (SiO₂) replacing wood tissue

AI-generated identification · may be incorrect

A polished, cabochon-like slice with a reddish-brown outer rim and pale yellow interior, probably microcrystalline quartz. Hardness is about 6.5–7 Mohs, vitreous to waxy luster, no distinct cleavage, and specific gravity near 2.6; the smooth oval shape is human-made.

Identified August 28, 2026More fossil →

Explore Polished fossilized wood (likely petrified wood) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Buried wood is gradually mineralized as silica-rich groundwater replaces organic tissue, commonly during the Triassic to Cenozoic eras. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used for cabochons, jewelry, ornaments, and lapidary collectibles; attractive patterned pieces may sell for more than ordinary petrified wood.

Geological facts

The key diagnostic feature is preserved wood grain or growth-ring structure, which may appear as faint linear or cellular patterns beneath polish. The colored rim could also be an applied backing or coating, so visual identification is provisional.

Field identification & locations

Check the cut face for unmistakable wood grain, cell structure, or rings; quartz hardness and density support identification. Common sources include Arizona, Oregon, Indonesia, Madagascar, and Australia.