mineral

Tumbled yellow-brown quartz, possibly citrine or iron-stained quartz

Quartz (SiO₂), likely iron-bearing or included variety

AI-generated identification · may be incorrect

Mohs hardness 7; translucent yellow-brown color, vitreous-to-waxy luster, and massive microcrystalline texture. Quartz lacks cleavage and has conchoidal fracture; the rounded form appears tumbled and wet.

Identified August 30, 2026More mineral →

Explore Tumbled yellow-brown quartz, possibly citrine or iron-stained quartz in the encyclopedia →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids or igneous melts, commonly in veins and cavities. Its yellow-brown color may result from iron impurities or surface staining; age depends on its host deposit.

Uses & applications

Used as a lapidary and decorative stone, with quartz also important in glass, electronics, abrasives, and countertops. This small tumbled piece has modest collector value.

Geological facts

True citrine is naturally yellow quartz, but much commercial “citrine” is heat-treated amethyst; natural color zoning and inclusions can help distinguish them. A scratch test against ordinary glass can support quartz identification, though it may damage the specimen.

Field identification & locations

Commonly found in hydrothermal veins, geodes, and quartz-rich igneous or metamorphic rocks worldwide, especially Brazil, Madagascar, and the United States. Confirm with hardness, streak (white), and ideally refractive index or spectroscopy.