metamorphic
Quartzite pebble (likely)
Quartzite; predominantly microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectTypically Mohs hardness 7, white to tan or gray, with a vitreous to sugary luster and interlocking quartz grains; usually lacks cleavage and has specific gravity near 2.65. The small specimen appears pale cream and weathered, though the image is insufficient for certain identification.
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Physical properties
Typically Mohs hardness 7, white to tan or gray, with a vitreous to sugary luster and interlocking quartz grains; usually lacks cleavage and has specific gravity near 2.65. The small specimen appears pale cream and weathered, though the image is insufficient for certain identification.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized under heat and pressure during regional metamorphism; ages vary widely depending on the parent sandstone and metamorphic event. Common in mountain belts and resistant stream gravels.
Uses & applications
Used as crushed stone, road aggregate, building stone, and decorative material; attractive pieces may be collected or polished, but this specimen appears low-grade and unexceptional.
Geological facts
Quartzite is tougher and generally more resistant to scratching than sandstone because its quartz grains are fused. A steel file should not scratch it, while glass can usually be scratched.
Field identification & locations
Commonly found as hard, light-colored resistant cobbles in rivers and glacial deposits; confirm with a hardness test and acid test, and inspect for fused grains rather than visible sand layering.
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