metamorphic
Banded quartzite (probable)
Quartzite; predominantly recrystallized quartz (SiO₂), possibly with mica or feldspar impurities
AI-generated identification · may be incorrectHardness about 7 Mohs; pale gray, cream, and brown banding; vitreous to dull luster; dense, granular crystalline texture with no obvious cleavage. The elongated, rounded shape suggests a naturally weathered or lightly worked specimen.
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Physical properties
Hardness about 7 Mohs; pale gray, cream, and brown banding; vitreous to dull luster; dense, granular crystalline texture with no obvious cleavage. The elongated, rounded shape suggests a naturally weathered or lightly worked specimen.
Formation & geological history
Forms when quartz-rich sandstone is subjected to substantial heat and pressure, welding quartz grains together during metamorphism. It may range from Precambrian to much younger ages depending on its source region.
Uses & applications
Used as crushed stone, aggregate, paving, countertops, and decorative rock; attractive banded pieces are collected but generally have modest value.
Geological facts
Quartzite commonly breaks across grains rather than around them, unlike sandstone, and can be harder than a steel knife. Exact identification is limited by the dark lighting and single photograph.
Field identification & locations
Look for very high hardness, quartz-like sparkle, and resistance to scratching; a steel knife should not scratch it. Common worldwide in metamorphic mountain belts, including India, Brazil, the United States, and Scandinavia.
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