metamorphic

Yellow-orange iron-stained quartzite

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

AI-generated identification · may be incorrect

Fine- to medium-grained, rough and streaky, with yellow-orange and pale gray bands and a dull to slightly vitreous luster. Quartz has Mohs hardness 7 and no cleavage; the specimen’s exact composition and identity cannot be confirmed from the image alone.

Identified September 23, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartz-rich sandstone recrystallized under heat and pressure into interlocking quartz grains; iron oxides likely caused the coloration. Its age and geological setting cannot be determined from appearance alone.

Uses & applications

Quartzite is used as building and decorative stone, aggregate, and occasionally for small lapidary pieces; this small rough fragment is primarily a collector specimen.

Geological facts

Quartzite is typically harder than glass and resists weathering; iron oxides can produce yellow, orange, or rust-colored staining.

Field identification & locations

Look for a hard, fused-looking quartz-rich texture and grains that fracture through rather than separate like sandstone. Quartzite occurs worldwide in metamorphic terrains; distinguishing it from iron-stained quartz or other rocks may require testing.