mineral

Honey-colored chalcedony (rough agate/chert)

Microcrystalline quartz, SiO₂; likely chalcedony with iron-oxide staining

AI-generated identification · may be incorrect

Typically hardness 6.5–7 Mohs, waxy to dull luster, translucent brown-yellow color, conchoidal fracture, and no cleavage. Its texture appears massive and cryptocrystalline rather than visibly crystalline.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities, fractures, or voids in volcanic and sedimentary rocks; iron oxides create the amber-brown color. Individual pieces may range from relatively young to Paleozoic or older depending on locality.

Uses & applications

Used for cabochons, carvings, tumbled stones, and ornamental objects; larger uniform pieces may be cut as decorative material. Common rough specimens generally have modest commercial value.

Geological facts

Chalcedony is quartz composed of microscopic intergrowths of quartz varieties. The specimen’s irregular fractured surface and translucent honey color are consistent with chalcedony, though visual identification alone cannot confirm the exact variety.

Field identification & locations

Commonly found in volcanic cavities, hydrothermal veins, and silicified sediments worldwide, including Brazil, Mexico, Uruguay, India, Madagascar, and the western United States. A steel file should not scratch it; testing streak, translucency, and hardness helps distinguish it from resin or glass.