metamorphic

Iron-stained quartz-rich rock (likely weathered quartzite)

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

AI-generated identification · may be incorrect

Rough, granular and rusty orange-brown with pale gray-white areas; quartz has Mohs hardness 7 and a vitreous to dull luster. The photo does not resolve grain boundaries or other features well enough to confirm quartzite over iron-stained sandstone or another quartz-rich rock.

Identified October 14, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartzite forms when quartz sandstone is recrystallized under heat and pressure; iron oxides can stain it during weathering. Its age and formation setting cannot be determined from the image.

Uses & applications

Quartzite is used as crushed stone, aggregate, paving and decorative stone; attractive pieces may be collected or used in lapidary work.

Geological facts

Its likely rusty coloration comes from iron oxides, commonly hematite or goethite, rather than metallic iron.

Field identification & locations

Look for interlocking quartz grains and a hard surface that scratches glass; quartzite typically breaks across grains rather than around them. Found worldwide in metamorphic terrains; a definitive ID requires closer examination.