fossil
Petrified Wood
Silicified Wood (SiO2)
Hardness: 6.5-7.0 (Mohs scale); Color: Brown, tan, grey; Luster: Waxy to vitreous; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Specific gravity: 2.6-2.9
- Hardness
- 6
- Color
- Brown, tan, grey
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Brown, tan, grey; Luster: Waxy to vitreous; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Specific gravity: 2.6-2.9
Formation & geological history
Formed via permineralization where organic wood materials are replaced by minerals (usually silica) while retaining original structure; typically Mesozoic or Cenozoic in age
Uses & applications
Collecting, jewelry (cabochons), interior decor, and scientific study of paleobotany
Geological facts
In the right conditions, even the cellular structure of the bark and rings are preserved in stone. The most famous location is Petrified Forest National Park in Arizona.
Field identification & locations
Identify by looking for wood-like grain, growth rings, or bark textures in a stone that feels much heavier and harder than wood. Frequently found in sedimentary basins and river beds.
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