mineral

Tumbled reddish-brown quartz (likely iron-stained quartz)

Quartz, SiO₂; likely colored by iron-oxide inclusions or surface staining

AI-generated identification · may be incorrect

Mohs hardness 7; translucent to opaque reddish-brown with cloudy white areas and a vitreous luster. Quartz has a trigonal crystal structure and no prominent cleavage; tumbling has rounded its edges. Exact identification is limited by the photo.

Identified October 2, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous and hydrothermal settings and in veins; iron oxides can stain or color it. Its age and precise geological source cannot be determined from the image.

Uses & applications

Commonly sold as a polished/tumbled collector stone or used in crafts and inexpensive jewelry; quartz also has major industrial uses in glass and electronics.

Geological facts

Quartz is one of Earth’s most abundant minerals. Iron impurities and coatings can produce a wide range of red, brown, and yellow colors.

Field identification & locations

The rounded, polished surface and cloudy translucence are consistent with tumbled quartz. Quartz occurs worldwide; hardness and lack of cleavage help distinguish it from softer lookalikes.