sedimentary

Polished rainbow jasper (likely ocean/imperial jasper)

Microcrystalline quartz (SiO₂) with iron oxides and varied silicate inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, multicolored red, tan, green, cream, and purple bands; waxy to vitreous luster and no visible cleavage. The oval cabochon is polished and likely cut from brecciated or flow-banded jasper.

Identified August 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or fractured rock; iron and other impurities create the colors. Geological ages vary widely, commonly Precambrian to Cenozoic depending on deposit.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary collections; generally decorative rather than industrial.

Geological facts

The specimen appears human-cut and polished, so its original texture is enhanced by the cabochon shape and glossy surface. “Rainbow jasper” is a trade name rather than a single precisely defined mineral species.

Field identification & locations

Identify it by its opaque patterned body, hardness, lack of cleavage, and fine-grained quartz texture; it should not fizz in dilute acid. Similar material occurs in Madagascar, Mexico, India, Indonesia, and the western United States.