metamorphic

Weathered quartz-rich rock, likely quartzite

Quartzite (predominantly quartz, SiO₂), possibly iron-stained quartz vein material

AI-generated identification · may be incorrect

Tan to reddish-brown, opaque, granular to sugary texture with white quartz patches and rusty iron-oxide staining; likely Mohs hardness ~7, vitreous to dull luster, no obvious cleavage, and conchoidal-to-irregular fracture. Exact identification is limited by the photograph.

Identified September 11, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone recrystallized under heat and pressure, commonly during regional metamorphism; iron-bearing fluids or weathering produced the orange-brown staining. Its precise geological age cannot be determined visually.

Uses & applications

Used as crushed stone, aggregate, building stone, and decorative landscaping material; attractive pieces may be collected but this specimen has modest gem value.

Geological facts

Quartzite is harder and more resistant to weathering than its sandstone precursor. A steel file should generally fail to scratch it, while quartz-rich surfaces may scratch glass.

Field identification & locations

Common in metamorphic mountain belts and quartz-vein zones worldwide. Test with a hardness pick or glass, inspect for interlocking quartz grains, and use dilute acid only if carbonate minerals are suspected.