mineral

Tumbled yellow quartz (likely citrine or yellow chalcedony)

Quartz, SiO₂; variety uncertain from image

AI-generated identification · may be incorrect

Mohs hardness 7; translucent honey-yellow color, vitreous to slightly waxy luster, and no visible cleavage. The rounded shape indicates tumbling or water wear; specific gravity is about 2.65.

Identified August 16, 2026More mineral →

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Physical properties

Mohs hardness 7; translucent honey-yellow color, vitreous to slightly waxy luster, and no visible cleavage. The rounded shape indicates tumbling or water wear; specific gravity is about 2.65.

Formation & geological history

Yellow coloration may result from iron impurities in quartz (citrine) or microcrystalline quartz (yellow chalcedony). Quartz forms in hydrothermal veins, cavities, and igneous rocks over varied geological ages.

Uses & applications

Used as a decorative and collecting stone; transparent citrine may be cut for jewelry, while opaque pieces are commonly sold as tumbled stones. Typical value is about $1–$10 for a small common piece, or $10–$50+ if naturally colored, transparent citrine.

Geological facts

The image cannot reliably distinguish citrine from yellow chalcedony, heat-treated amethyst, or dyed quartz. Natural citrine is relatively uncommon compared with heat-treated material.

Field identification & locations

Common sources include Brazil, Uruguay, Madagascar, and the United States. Check for glassy luster, hardness, and lack of cleavage; scratching glass supports quartz identification, though this test can damage surfaces.