sedimentary

Orbicular jasper (picture jasper)

Silicified volcanic or sedimentary rock; chiefly microcrystalline quartz (SiO₂) with iron-oxide pigments

AI-generated identification · may be incorrect

Typically 6.5–7 Mohs, opaque, tan to reddish-brown with intricate cream, gray, and dark dendritic/orbicular patterns; dull to waxy luster and no visible cleavage. Patterns commonly reflect silica replacement, fractures, and iron/manganese staining rather than true crystals.

Identified August 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement volcanic ash, breccia, or fine sediment, while iron oxides create the red-brown colors; age depends on locality, commonly Paleozoic to Cenozoic. The specimen appears naturally weathered and unpolished.

Uses & applications

Used for lapidary slabs, cabochons, carvings, bookends, and decorative stone; attractive patterned pieces have modest collector value.

Geological facts

“Picture jasper” is a trade name for scenic patterned jasper, not one single mineral species. Acid generally produces little reaction, and a quartz-like hardness makes it resistant to scratching.

Field identification & locations

Identify by its opaque silica-rich body, hardness, earthy colors, and landscape-like or brecciated pattern; common sources include Oregon, Idaho, Utah, Arizona, Mexico, Madagascar, and Australia. A glassy fracture and inability to scratch it with a steel knife support identification.