metamorphic

Weathered quartz-rich metamorphic rock (likely quartzite)

Quartzite, predominantly crystalline SiO₂, with iron-oxide staining and possible feldspar/mica

AI-generated identification · may be incorrect

Hardness about 7 Mohs; gray, white, pink, and reddish-brown coloration; vitreous to sugary luster; interlocking quartz grains, generally massive with no strong cleavage. The red-brown areas likely reflect hematite or limonite.

Identified September 14, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone was recrystallized under heat and pressure, commonly during regional mountain-building; its exact geological age cannot be determined from the image. Surface fracturing and iron staining indicate prolonged weathering and exposure.

Uses & applications

Used as durable aggregate, riprap, building stone, paving, countertops, and decorative material; attractive pieces may be collected as lapidary rough, though this specimen appears field-scale and heavily weathered.

Geological facts

Quartzite commonly breaks across grains rather than around them and can be harder than the steel used in a knife. Iron oxides produce the pink, red, and brown patterns.

Field identification & locations

Identify it by its very hard, fused texture, granular quartz sparkle, and resistance to scratching with a steel knife; acid produces no fizz. Common in ancient mountain belts and exposed metamorphic terrains worldwide.