metamorphic

Polished rainbow jasper (likely orbicular jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron and other mineral inclusions

AI-generated identification · may be incorrect

Smooth, tumbled pebble with white, pink-red, dark green/gray, and yellow patches. Quartz hardness is about 6.5–7 Mohs; opaque, waxy to vitreous luster, with no visible cleavage and a very fine-grained structure.

Identified October 11, 2026More metamorphic →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill cavities or replace sediment, with colors and patterns produced by mineral impurities. Deposits formed in varied geological settings and ages; the pictured stone’s exact source cannot be determined from appearance alone.

Uses & applications

Commonly cut and polished for jewelry, beads, ornaments, and lapidary collections; not generally used as construction stone.

Geological facts

Jasper is a trade name covering many patterned, opaque chalcedonies; “rainbow” and “orbicular” labels often describe appearance rather than a distinct mineral species.

Field identification & locations

A polished surface and opaque, multicolored silica-rich pattern are characteristic; jasper occurs worldwide. This small tumbled piece would typically sell for about $2–$10 USD.