metamorphic
Weathered quartz-rich metamorphic rock, possibly quartzite or vein quartz
Quartzite / massive quartz (SiO₂), identification uncertain from photograph
AI-generated identification · may be incorrectWhite to gray, sugary-to-glassy quartz texture with rusty staining and irregular cavities; quartz hardness ~7 Mohs, vitreous luster, no cleavage, and conchoidal fracture. The rounded, highly weathered surface may obscure original layering or brecciation.
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Physical properties
White to gray, sugary-to-glassy quartz texture with rusty staining and irregular cavities; quartz hardness ~7 Mohs, vitreous luster, no cleavage, and conchoidal fracture. The rounded, highly weathered surface may obscure original layering or brecciation.
Formation & geological history
Likely formed when quartz-rich sandstone recrystallized during metamorphism, or from hydrothermal quartz-vein deposition; age depends on locality and cannot be determined visually. Cavities may reflect dissolved minerals, weathering, or breccia fragments.
Uses & applications
Quartzite is used as crushed aggregate, road stone, building stone, and decorative rock; attractive pieces are collected but this specimen has modest commercial value.
Geological facts
Quartz-rich rocks commonly resist weathering while surrounding minerals dissolve, producing pitted surfaces and vugs. Gray or orange-brown areas may represent iron-oxide staining or minor impurities.
Field identification & locations
Look for abundant interlocking quartz grains, hardness sufficient to scratch glass, and lack of fizz with dilute hydrochloric acid; a steel knife should not scratch it. Common worldwide in metamorphic belts and hydrothermal vein systems.
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