metamorphic

Iron-stained quartzite

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

AI-generated identification · may be incorrect

Brown to reddish-brown, massive and granular with a dull to slightly vitreous luster; quartz hardness is 7 Mohs, and the rock has no distinct cleavage. The image alone does not show enough detail to confirm mineral composition or specific gravity.

Identified October 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when quartz-rich sandstone is recrystallized by heat and pressure during metamorphism; formation age depends on its source and metamorphic history and cannot be determined from appearance.

Uses & applications

Used as crushed stone, building and paving stone, and decorative landscaping material; attractive pieces may be collected or polished.

Geological facts

Iron oxides commonly impart red, brown, or yellow coloration. Quartz grains in true quartzite are tightly interlocked, making it notably resistant to weathering.

Field identification & locations

Look for a hard, quartz-rich rock that scratches glass and tends to fracture through grains rather than around them; common in metamorphic mountain belts worldwide. The pictured specimen may be another iron-stained, fine-grained rock, so a hardness test or close examination is needed for reliable identification.