metamorphic
White quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly crystalline SiO₂, possibly micaceous or feldspathic
AI-generated identification · may be incorrectHardness about 7 Mohs; white to pale gray, vitreous to sugary luster, granular interlocking quartz crystals, and little visible cleavage. The irregular layered surface may indicate relict bedding or foliation, with minor mica or feldspar.
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Physical properties
Hardness about 7 Mohs; white to pale gray, vitreous to sugary luster, granular interlocking quartz crystals, and little visible cleavage. The irregular layered surface may indicate relict bedding or foliation, with minor mica or feldspar.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized under heat and pressure during regional metamorphism; its exact geological age cannot be determined from the image. Common in metamorphic mountain belts and ancient sedimentary sequences.
Uses & applications
Used as crushed stone, aggregate, road material, building stone, countertops, and decorative slabs; attractive clean pieces may be collected, though this specimen appears common.
Geological facts
Quartzite commonly breaks across grains rather than around them, producing a hard, sharp fracture. It can resemble marble, but quartzite is generally harder and does not fizz with dilute hydrochloric acid.
Field identification & locations
Commonly found in uplifted metamorphic terrains worldwide, including the Appalachians, Rocky Mountains, Scandinavia, India, and Brazil. A steel nail usually fails to scratch it; a fresh surface should show abundant sparkly quartz grains.
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