metamorphic

Iron-stained quartz-rich rock, likely weathered quartzite

Quartzite (predominantly quartz, SiO₂), with iron-oxide staining

AI-generated identification · may be incorrect

Mostly cream-white and brown, with a glassy to dull luster; quartz has Mohs hardness 7 and a trigonal crystal structure. The rounded surface and visible patches suggest iron oxides coating or staining the quartz-rich material; exact identification is uncertain from the image alone.

Identified September 29, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartzite forms when quartz sandstone is recrystallized by heat and pressure during metamorphism. Iron-bearing fluids or weathering can produce brown and reddish staining; no geological age can be determined from appearance alone.

Uses & applications

Quartzite is used as crushed aggregate, paving and building stone, and decorative material; this small stained specimen is mainly suitable for collecting or display.

Geological facts

Quartzite is typically hard enough to scratch glass and, unlike many sandstones, tends to fracture through quartz grains rather than around them.

Field identification & locations

Look for a hard, quartz-rich texture and test cautiously for glass scratching; common in metamorphic mountain belts worldwide. The image does not show enough detail to distinguish quartzite confidently from iron-stained quartz or another quartz-rich rock.