sedimentary

Polished picture jasper

Silicified microcrystalline quartz (chalcedony), commonly called picture jasper

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; reddish-brown, cream, and gray flowing bands with a waxy to glassy polish. Cryptocrystalline quartz has no visible cleavage and typically shows conchoidal fracture; density is about 2.6 g/cm³.

Identified August 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Usually forms when silica-rich groundwater replaces or cements volcanic ash, mudstone, or other sediments, preserving layered patterns. Its exact geological age depends on locality; many commercial varieties are Paleozoic to Cenozoic.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and decorative objects; lapidary value comes from attractive landscape-like patterning.

Geological facts

The specimen is likely tumbled or polished, exposing intricate “picture” banding rather than natural weathered surfaces.

Field identification & locations

Identify it by its fine-grained quartz texture, hardness, opaque coloration, and non-repeating natural bands; it commonly comes from Oregon, Utah, Idaho, Arizona, Madagascar, and Australia. A steel blade should not easily scratch it, though testing may damage the polish.