mineral

Yellow chalcedony (likely citrine or iron-stained quartz)

Microcrystalline quartz, SiO₂; yellow coloration likely from iron oxides or included quartz varieties

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale yellow-orange, waxy to slightly vitreous luster, massive and non-cleavable with conchoidal fracture. The rounded shape suggests natural abrasion or tumbling; exact identification requires translucency, streak, and hardness tests.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed from silica-rich fluids in cavities, veins, or sedimentary environments; iron staining developed during later weathering. Quartz deposits range from Precambrian to recent, so age cannot be determined visually.

Uses & applications

Used as a lapidary, carving, ornamental, and collector material; attractive translucent pieces may be sold as cabochons or tumbled stones. Common opaque pieces have modest value.

Geological facts

Its yellow color can resemble citrine, yellow jasper, honey calcite, or resin, but quartz is much harder than calcite and will scratch glass. A definitive distinction may require testing or microscopy.

Field identification & locations

Commonly found in weathered quartz veins, cavities, gravel, and alluvial deposits worldwide, especially Brazil, Madagascar, Uruguay, and India. Estimated value: $2–$15 as a small rough/tumbled specimen, or $20–$100+ if unusually translucent and gem-quality.