sedimentary

Polychrome jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides and other inclusions

AI-generated identification · may be incorrect

Opaque, multicolored red, cream, yellow, brown, and gray; waxy to dull luster; hardness about 6.5–7 Mohs; no cleavage; cryptocrystalline quartz structure; specific gravity about 2.55–2.70.

Identified August 19, 2026More sedimentary →

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Physical properties

Opaque, multicolored red, cream, yellow, brown, and gray; waxy to dull luster; hardness about 6.5–7 Mohs; no cleavage; cryptocrystalline quartz structure; specific gravity about 2.55–2.70.

Formation & geological history

A silica-rich sediment or volcanic ash was silicified and later stained by iron-bearing fluids, producing the brecciated or flowing patterns. Most polychrome jasper formed in relatively young volcanic or sedimentary settings, commonly during the Cenozoic, though age varies by locality.

Uses & applications

Used for cabochons, beads, carvings, polished slabs, lapidary objects, and decorative stone; rough pieces are mainly collector material.

Geological facts

Its colors and patterns are natural rather than crystal faces, and each piece is highly individual. The specimen appears rough-cut or partly polished, with jasper-like opaque chalcedony rather than transparent agate.

Field identification & locations

Identify it by its opaque waxy silica appearance, conchoidal fracture, hardness, and inability to scratch with a steel knife easily; it commonly occurs in nodules, veins, and volcanic terrains, especially Oregon, Madagascar, Mexico, and Indonesia.