mineral

Tumbled chalcedony (possibly peach agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

AI-generated identification · may be incorrect

Polished, translucent pale peach-tan pebble with a waxy-to-glassy luster and no visible crystal faces or cleavage. Mohs hardness 6.5–7; trigonal quartz structure; specific gravity about 2.6.

Identified October 14, 2026More mineral →

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Physical properties

Polished, translucent pale peach-tan pebble with a waxy-to-glassy luster and no visible crystal faces or cleavage. Mohs hardness 6.5–7; trigonal quartz structure; specific gravity about 2.6.

Formation & geological history

Silica-rich fluids deposited quartz in rock cavities, later developing microcrystalline chalcedony; the pebble has been shaped and polished. The image does not reveal its precise geological age or source.

Uses & applications

Used for tumbling, beads, cabochons, and decorative objects; common varieties are also used as silica material.

Geological facts

Chalcedony is quartz with crystals too fine to distinguish without magnification; agate specifically has visible banding, which is not apparent here.

Field identification & locations

Look for hardness near 7, a smooth waxy surface, and translucent edges; visible bands would support an agate identification. Chalcedony occurs worldwide, including Brazil, Uruguay, India, and the United States.