gemstone

Tumbled chalcedony pendant (likely agate)

Chalcedony, microcrystalline quartz (SiO₂); the pale bands suggest agate

AI-generated identification · may be incorrect

Translucent tan to honey-brown with milky, irregular bands and a waxy-to-vitreous luster; Mohs hardness 6.5–7, trigonal quartz structure, no visible cleavage. The gold-colored bail is jewelry hardware, not part of the specimen.

Identified October 2, 2026More gemstone →

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Physical properties

Formation & geological history

Silica-rich fluids deposited quartz in rock cavities, with banding produced by changes in deposition; agates form in many geological periods, commonly in volcanic rocks. The stone has been tumbled and polished.

Uses & applications

Used as an ornamental pendant and collectible; chalcedony is also carved and made into beads, cameos, and small decorative objects.

Geological facts

Agate is a banded variety of chalcedony, and its natural bands can vary from distinct concentric layers to diffuse, irregular patterns.

Field identification & locations

Look for waxy luster, translucence, hardness, and curved or irregular banding; common sources include Brazil, Uruguay, India, and the western United States. The image supports a likely identification, but does not show enough detail to confirm the exact variety.