sedimentary

Jasper (Petrified Wood Variety)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Pink, purple, tan, and reddish-brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Pink, purple, tan, and reddish-brown
Luster: Vitreous to waxy

Identified April 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the process of permineralization, where organic wood material is replaced by silica-rich water over millions of years. This piece likely dates from the Triassic period (approx. 225 million years ago).

Uses & applications

Used primarily for lapidary work, jewelry (cabochons), interior decoration (bookends, tabletops), and as a popular collector's specimen.

Geological facts

The vibrant pink and purple hues in this specimen are often caused by trace amounts of manganese or iron oxides during the agatization process. Famous deposits include the Petrified Forest National Park in Arizona.

Field identification & locations

Identify by its heavy weight, woody texture often visible on the outer 'bark' layer, and characteristic conchoidal (shell-like) fractures on smooth surfaces. It cannot be scratched by a steel knife.