mineral

Tumbled honey-colored chalcedony (possibly yellow agate)

Microcrystalline quartz, SiO₂; chalcedony, potentially banded agate

AI-generated identification · may be incorrect

Polished, translucent yellow-brown pebble with a waxy to glassy luster. Quartz hardness is 6.5–7; crystals are microscopic and cleavage is absent. The photo does not show diagnostic banding, so exact identification is uncertain.

Identified October 14, 2026More mineral →

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Physical properties

Formation & geological history

Chalcedony forms when silica-rich fluids deposit quartz in cavities or fractures; agate develops when deposition forms bands. Its geological age and source cannot be determined from the image.

Uses & applications

Used for beads, cabochons, ornaments, and collectible tumbled stones; agate also has limited industrial uses as a durable silica material.

Geological facts

Agate is a variety of chalcedony, not a separate mineral species. Dyeing can alter the color of polished stones, and appearance alone cannot confirm treatment.

Field identification & locations

Look for waxy luster, translucence, hardness, and—if present—distinct curved bands; common sources include Brazil, Uruguay, India, and the United States. A gemstone test or close inspection is needed to distinguish natural chalcedony from other polished materials.