fossil

Petrified Wood

Silicified wood (Quartz replacement, SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on the Mohs scale, Color: Brown, yellow, grey, and tan with distinct longitudinal grain patterns, Luster: Vitreous to dull, Crystal structure: Microcrystalline quartz (chalcedony/jasper)

Hardness: 6

Identified August 4, 2026More fossil →

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Physical properties

Formation & geological history

Formed when buried organic plant material is saturated with mineral-rich water, allowing silica to replace organic matter cell-by-cell over millions of years

Uses & applications

Used in lapidary arts, decorative items, bookends, jewelry, and prized by fossil and mineral collectors

Geological facts

The wood structure, including growth rings and cellular details, is often perfectly preserved in stone

Field identification & locations

Identified by its wood-like grain and texture combined with a stone-like weight and hardness of quartz; commonly found in ancient alluvial deposits and volcanic ash beds worldwide