mineral

Yellow chalcedony (likely honey agate/jasper)

Microcrystalline quartz, SiO₂; may contain iron-oxide inclusions

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; yellow to orange-brown, waxy to dull luster, cryptocrystalline quartz with no visible cleavage and conchoidal fracture. The rounded, opaque appearance suggests jasper or iron-stained chalcedony rather than gem-quality transparent quartz.

Identified September 14, 2026More mineral →

Explore Yellow chalcedony (likely honey agate/jasper) in the encyclopedia →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures, later colored by iron oxides; commonly Cenozoic to older volcanic or sedimentary host rocks. Exact age cannot be determined from the photograph.

Uses & applications

Used as a lapidary stone for cabochons, beads, carvings, and tumbled stones; attractive pieces are collectible but usually inexpensive.

Geological facts

Chalcedony is quartz composed of extremely small intergrown crystals. Yellow coloration commonly results from hydrated iron oxides or other mineral impurities.

Field identification & locations

Identify by its fine, uniform texture, waxy surface, hardness, and conchoidal fracture; it should not be scratched easily by a steel knife. Common sources include Brazil, Uruguay, Madagascar, India, and the western United States.