mineral

Tumbled yellow-brown stone, likely iron-stained quartz or chalcedony

Quartz (SiO₂), possibly microcrystalline quartz (chalcedony); identification is uncertain from the image alone

AI-generated identification · may be incorrect

Polished, translucent to opaque golden-brown with darker inclusions and vitreous luster. Quartz has Mohs hardness 7 and a trigonal crystal structure; the stone’s rounded shape is from tumbling, not natural cleavage.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in silica-rich veins and cavities, then acquires brown-yellow iron-oxide staining; its age and exact formation environment cannot be determined visually.

Uses & applications

Commonly used for tumbling, beadwork, jewelry, and mineral collecting; quartz also has extensive industrial uses.

Geological facts

Iron oxides can produce yellow, orange, and brown coloration in otherwise colorless quartz.

Field identification & locations

Quartz is common worldwide; check for glassy luster and hardness, though a scratch test can damage a polished specimen. Similar-looking stones may include jasper or calcite, so precise identification may require testing.