metamorphic

Quartz-rich rock fragment (likely quartzite)

Quartzite, composed chiefly of quartz (SiO₂)

AI-generated identification · may be incorrect

Small, pale tan-gray fragment with a granular, slightly sparkly surface; quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure, though individual grains are not clearly visible here. Identification from the image is tentative; the piece could also be a quartz-rich vein fragment.

Identified September 27, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartzite forms when quartz sandstone is recrystallized by heat and pressure during metamorphism. This process occurs in many mountain belts across a wide range of geological ages.

Uses & applications

Quartzite is used as crushed aggregate, building and decorative stone, and occasionally as a lapidary material; this small fragment has little practical value.

Geological facts

Quartzite is usually much harder and more resistant to weathering than its sandstone precursor. A scratch test on an inconspicuous spot can help distinguish it from softer, similar-looking rocks.

Field identification & locations

Look for a hard, quartz-rich texture and grains fused into a cohesive mass; common occurrences include metamorphic mountain belts and quartz veins. The image does not show enough detail to confirm the rock type.