metamorphic

Iron-stained quartzite (probable)

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

AI-generated identification · may be incorrect

Hardness about 7 Mohs; gray-white to pale blue-gray with orange-brown hematite/goethite staining. Typically vitreous to dull luster, interlocking granular quartz texture, massive structure, and no obvious cleavage; it should scratch ordinary glass.

Identified September 6, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone was deeply buried and recrystallized during metamorphism, with later weathering or hydrothermal fluids depositing iron oxides. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used as crushed aggregate, road stone, building stone, and occasionally as decorative lapidary material; attractive pieces may be polished, though this specimen appears relatively ordinary.

Geological facts

The orange coloration is likely iron oxides rather than an orange mineral. Quartzite commonly breaks across grains, producing a sugary or splintery fracture rather than sandstone-like layering.

Field identification & locations

Look for a fused, granular texture and lack of visible sand grains or bedding; a steel nail should not scratch it, while quartz should. Common in metamorphic mountain belts worldwide, including the Appalachians, western U.S., Brazil, India, and Australia.