metamorphic

Iron-stained quartzite (tentative identification)

Quartzite, composed mainly of quartz (SiO₂), with reddish-brown iron-oxide staining

AI-generated identification · may be incorrect

Small, rough, opaque reddish-brown specimen with a granular appearance; quartz hardness is about 7 Mohs, vitreous to dull luster, and no cleavage. The photo does not show enough detail for a definitive identification.

Identified September 29, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when quartz-rich sandstone is recrystallized by heat and pressure, welding quartz grains together. This process has occurred throughout geologic time in metamorphic belts.

Uses & applications

Quartzite is used as construction and decorative stone, aggregate, and sometimes for carving or collecting; this small specimen has little practical value.

Geological facts

Iron oxides such as hematite can impart red, rust, or brown colors to otherwise pale quartz-rich rocks.

Field identification & locations

Look for interlocking quartz grains and a hard surface that resists scratching by steel; quartzite commonly occurs in metamorphic mountain belts worldwide. A close-up or scratch test would help distinguish it from iron-rich jasper or another rock.