mineral

Yellow Chalcedony (Agate or Citrine Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Pale yellow to golden honey; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Pale yellow to golden honey
Luster: Vitreous to waxy

Identified June 9, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Pale yellow to golden honey; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Formed in volcanic and sedimentary environments through the deposition of silica-rich fluids in rock cavities. Most yellow quartz or chalcedony specimens date from the Cenozoic to Mesozoic eras.

Uses & applications

Commonly used in jewelry (cabochons), ornamental carvings, crystal healing practices, and as a collector's specimen.

Geological facts

Yellow variety of quartz is often naturally rare; much of the 'Citrine' on the market is actually heat-treated Amethyst, though natural yellow chalcedony occurs frequently in river beds.

Field identification & locations

Identify by its translucency and inability to be scratched by a steel pocket knife. Commonly found in river gravels, volcanic regions, and beach wash-ups. Look for waxy texture and conchoidal 'shell-like' fractures.

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