fossil

Fossilized wood (petrified wood), likely silicified

Petrified wood; predominantly microcrystalline quartz (SiO₂) replacing wood tissue

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; orange-gold coloration, earthy to waxy luster, and preserved grain/bark-like texture. It is typically massive rather than crystalline, with no obvious cleavage and specific gravity around 2.4–2.7.

Identified August 17, 2026More fossil →

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Physical properties

Formation & geological history

Buried wood was mineralized as silica-rich groundwater replaced organic tissues and filled cells, usually during burial in volcanic ash or sediment. Ages range from tens of thousands to hundreds of millions of years, depending on locality.

Uses & applications

Used as a lapidary material for cabochons, carvings, polished slices, and collectibles; large pieces may serve as decorative stone. It has little industrial value compared with ordinary quartz.

Geological facts

The visible linear grain and bark-like fractured surface strongly suggest petrified wood rather than a conventional mineral specimen. Iron oxides commonly create orange, yellow, red, and brown colors.

Field identification & locations

Identify by recognizable wood grain, cell patterns, and very high hardness; it should not feel soft or fibrous like ordinary wood. Common localities include Arizona, Utah, Indonesia, Madagascar, and Australia.