mineral

Yellow chalcedony or citrine-like polished stone

Chalcedony (microcrystalline SiO₂), possibly iron-stained quartz

AI-generated identification · may be incorrect

Small polished, rounded yellow specimen with a waxy-to-vitreous luster; quartz hardness is about Mohs 7, with no obvious cleavage and white streak. The image is too blurred to distinguish chalcedony from dyed agate, citrine, or another yellow mineral confidently.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Quartz-rich silica formed from hydrothermal or groundwater deposition in cavities and veins; yellow color commonly results from iron impurities or treatment. Such silica can form in volcanic rocks from the Cenozoic to much older ages.

Uses & applications

Used as a lapidary stone, cabochon, bead, carving, or inexpensive collectible; translucent yellow material may be sold as citrine or yellow agate.

Geological facts

Chalcedony is cryptocrystalline quartz composed of intergrown quartz and moganite. Strong, even yellow color in a low-cost polished piece may indicate dyeing or heat treatment.

Field identification & locations

Test carefully with a steel file or glass only if damage is acceptable: genuine quartz-family material resists scratching; inspect translucency, banding, bubbles, and dye concentration in cracks. Common sources include Brazil, Uruguay, India, Madagascar, and the United States.