metamorphic

Likely quartz-rich metamorphic rock fragment

Probable quartzite or quartz-bearing schist; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Pale gray-white, granular and opaque with a dull to slightly glassy luster; likely quartz-dominant, Mohs hardness about 7, with no obvious cleavage. The angular fragment appears naturally fractured, possibly with minor mica or feldspar.

Identified September 22, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartzite forms when quartz sandstone is recrystallized during metamorphism, commonly during mountain-building; schist forms under similar conditions with visible aligned mica. Precise age and formation region cannot be determined visually.

Uses & applications

Common quartzite is used as crushed stone, aggregate, paving, and decorative rock; attractive pieces may be collected, but this fragment has little commercial or jewelry value.

Geological facts

Quartz-rich rocks commonly show a sugary texture and resist scratching by a steel knife; quartzite typically breaks across grains rather than around them.

Field identification & locations

Look for a hard, fused texture and abundant quartz; a streak test should be white, and glass should be scratchable. Quartzite occurs widely in metamorphic belts worldwide, including the Appalachian, Rocky, and Himalayan regions.