sedimentary

Biggs Jasper

Cryptocrystalline Quartz (Silicon Dioxide) - SiO2

Hardness: 6.5-7 (Mohs scale); Color: Tans, browns, and ochre with landscape-like banding; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9

Hardness: 6
Color: Tans, browns, and ochre with landscape-like banding
Luster: Vitreous to waxy

Identified March 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as silica-rich mud deposited in the presence of iron oxides, which settled on volcanic or basalt flows during the Miocene epoch (approx. 10-15 million years ago). The distinct banding is caused by rhythmic deposition and environmental pressure changes.

Uses & applications

Predominantly used as a lapidary material for high-end jewelry (cabochons), interior decor, or as a polished display specimen for collectors.

Geological facts

Biggs Jasper is considered a 'picture jasper' because its patterns often resemble rolling hills or deserts. It was first discovered in the 1960s near Biggs Junction, Oregon, during road construction for Interstate 84.

Field identification & locations

Identify by its 'desert landscape' appearance and smooth, glass-like surface when polished. Found specifically in the Pacific Northwest, USA (Oregon/Washington). Collectors should look for high-contrast banding and 'sky' or 'hill' features.

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