mineral

Tumbled yellow-brown quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂), commonly colored by iron-oxide inclusions

AI-generated identification · may be incorrect

Mohs hardness 7; translucent yellow-brown body, vitreous-to-waxy luster, conchoidal fracture, and no cleavage. The rounded shape indicates natural water wear or tumbling; surface appears somewhat frosted or weathered.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, or sedimentary veins; yellow coloration commonly results from iron impurities or heat-treated amethyst. A precise geological age and origin cannot be determined from the photograph.

Uses & applications

Used as a lapidary and decorative stone; attractive transparent pieces may be cut as gemstones. Ordinary specimens have little industrial or construction value.

Geological facts

Citrine is the yellow variety of quartz, while naturally occurring citrine is relatively uncommon; much commercial “citrine” is heat-treated amethyst. Color alone cannot reliably distinguish natural from treated material.

Field identification & locations

Commonly found in quartz veins, granitic and metamorphic rocks, and alluvial gravels. A glassy luster, hardness sufficient to scratch ordinary glass, and conchoidal fracture support quartz identification; acid does not react.