gemstone

Polished agate or jasper cabochon

Cryptocrystalline quartz, SiO₂, possibly iron-rich jasper inclusions

AI-generated identification · may be incorrect

Small polished oval with translucent gray-brown to orange coloration and darker internal patches; vitreous to waxy luster, Mohs hardness about 6.5–7, no obvious cleavage, and specific gravity near 2.6. The image is insufficient to distinguish agate from jasper confidently.

Identified August 12, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities in volcanic rock, later depositing chalcedony and iron-bearing minerals in bands or patches. Such material commonly formed during volcanic episodes from the Paleozoic to Cenozoic eras.

Uses & applications

Used for cabochons, beads, carvings, and decorative objects; polished pieces are popular inexpensive gemstones.

Geological facts

Agate is translucent and commonly banded, whereas jasper is more opaque and massive; mixed agate-jasper specimens are common.

Field identification & locations

Check translucency against a strong light, inspect for chalcedony banding, and test hardness only inconspicuously because quartz can scratch glass. Common sources include Brazil, Uruguay, Mexico, India, Madagascar, and the western United States.