metamorphic

Iron-stained quartzite

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

AI-generated identification · may be incorrect

Tan to brown, rough, and granular with rusty red-brown patches; quartz has Mohs hardness 7 and a vitreous to dull luster. The specimen appears massive, without obvious cleavage; exact mineral proportions cannot be determined from the image.

Identified September 25, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when quartz-rich sandstone is recrystallized by heat and pressure, typically during regional metamorphism; its age depends on the source sandstone and metamorphic event and cannot be inferred visually.

Uses & applications

Quartzite is used as building and paving stone, decorative facing, and crushed aggregate; this small rough piece is mainly suitable for collecting.

Geological facts

Iron oxides such as hematite or goethite commonly create rusty coloration in quartz-rich rocks.

Field identification & locations

Look for a hard, interlocking quartz texture and fracture through grains rather than around them; quartzite occurs worldwide in metamorphic terrains. A hand specimen like this commonly sells for about $1–$15 USD.