sedimentary
Petrified Wood
Silicified Wood (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous to waxy luster, amorphous crystal structure, and specific gravity around 2.65.
Identified More sedimentary →
Explore Petrified Wood in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 7 on the Mohs scale, vitreous to waxy luster, amorphous crystal structure, and specific gravity around 2.65.
Formation & geological history
Formed through permineralization, where organic wood material is entirely replaced by minerals like quartz over millions of years.
Uses & applications
Used primarily in decorative items, jewelry making, bookends, and as valuable specimens for fossil and rock collectors.
Geological facts
Famous deposits include the Petrified Forest National Park in Arizona, containing trees dating back over 200 million years.
Field identification & locations
Identifiable by retaining distinct wood grain patterns and growth rings despite being turned entirely to solid stone.
More like this
Other sedimentary specimens
Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary