mineral

Tumbled yellow-brown agate

Agate, a banded variety of microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent golden-brown with cloudy bands, vitreous to waxy luster, and no visible cleavage. Quartz has a trigonal crystal structure; the specimen is rounded and polished.

Identified September 25, 2026More mineral →

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Physical properties

Hardness 6.5–7 Mohs; translucent golden-brown with cloudy bands, vitreous to waxy luster, and no visible cleavage. Quartz has a trigonal crystal structure; the specimen is rounded and polished.

Formation & geological history

Forms as silica-rich fluids deposit chalcedony in cavities, commonly in volcanic rocks; its exact age and locality cannot be determined from the photo.

Uses & applications

Used for jewelry, beads, ornaments, and lapidary collecting; agate is also used for small decorative objects.

Geological facts

Agate’s fine quartz crystals are too small to distinguish individually without magnification; polishing can reveal subtle internal banding.

Field identification & locations

The translucent body and curved, cloudy bands suggest agate, but the small image does not show enough detail for confident variety or locality identification. Common sources include Brazil, Uruguay, India, and the United States.