mineral

Tumbled quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Translucent honey-brown, vitreous luster, and irregularly tumbled shape; quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure. The brown color likely comes from iron impurities or irradiation-related coloration.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, hydrothermal, and metamorphic environments over a wide range of geological ages; this piece has been mechanically polished or naturally rounded. The exact locality and age cannot be determined from the photograph.

Uses & applications

Used for ornamental stone, jewelry, lapidary items, and crystal collecting; common tumbled pieces typically have modest value.

Geological facts

True citrine is relatively uncommon; much commercial “citrine” is heat-treated amethyst, which may show orange coloring and a white base. Quartz commonly produces a glassy scratch on ordinary glass.

Field identification & locations

Look for glass-like luster, translucency, hardness, and absence of cleavage; test only on an inconspicuous area because scratching can damage the specimen. Quartz is widespread worldwide, especially in Brazil, Madagascar, the United States, and the Alps.