mineral

Tumbled pale agate or chalcedony

Microcrystalline quartz (SiO₂), likely agate/chalcedony

AI-generated identification · may be incorrect

Cream to pale tan, waxy-to-dull luster, opaque to slightly translucent, with subtle cloudy banding; hardness about 6.5–7 Mohs and no cleavage. The rounded edges indicate tumbling or polishing.

Identified August 17, 2026More mineral →

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Physical properties

Cream to pale tan, waxy-to-dull luster, opaque to slightly translucent, with subtle cloudy banding; hardness about 6.5–7 Mohs and no cleavage. The rounded edges indicate tumbling or polishing.

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; most agate formed during the Paleozoic–Cenozoic, depending on locality. The specimen’s exact origin cannot be determined from the image.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary items; also collected as a decorative stone.

Geological facts

Agate is a banded variety of chalcedony, while unbanded material is generally called chalcedony. Its toughness and lack of cleavage make it durable in jewelry.

Field identification & locations

Identify by its glassy/waxy feel, hardness, conchoidal fracture, and possible fine banding; it should scratch glass but not be scratched by a steel knife. Common sources include Brazil, Uruguay, India, Mexico, and the western United States.