metamorphic

Tumbled yellow stone (likely yellow jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Yellow, opaque, and smoothly tumbled with a fine-grained appearance. If jasper, hardness is about 6.5–7 Mohs, luster is waxy to dull, and the quartz has a trigonal crystal structure too fine to see; specific gravity is about 2.6.

Identified September 23, 2026More metamorphic →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill and cement sediment or volcanic material, with iron oxides adding yellow color. Its age and precise formation setting cannot be determined from the image.

Uses & applications

Used for beads, cabochons, ornaments, and inexpensive collectible tumbled stones.

Geological facts

Jasper is defined by its opacity and microcrystalline quartz composition; color alone is not enough to identify it confidently.

Field identification & locations

The rounded shape indicates tumbling or polishing. Compare hardness and surface texture; common jasper sources include India, Brazil, Madagascar, and the western United States.