metamorphic
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar, mica, or iron oxides
AI-generated identification · may be incorrectHardness about 7 Mohs; tan to cream, granular and unevenly textured, with white vitreous quartz patches and generally no obvious cleavage. Dense, massive, and sparkly where quartz grains are exposed; exact identification is limited by the photograph.
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Physical properties
Hardness about 7 Mohs; tan to cream, granular and unevenly textured, with white vitreous quartz patches and generally no obvious cleavage. Dense, massive, and sparkly where quartz grains are exposed; exact identification is limited by the photograph.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized under heat and pressure during regional metamorphism, commonly from Precambrian to younger mountain-building events. It occurs in metamorphic belts and uplifted mountain terrains.
Uses & applications
Used as crushed aggregate, road stone, building and facing stone, paving, and decorative slabs; attractive pieces may be collected or used ornamentally, though this specimen appears ordinary.
Geological facts
Quartzite commonly preserves sandstone-like layering while its quartz grains are fused, making it considerably more resistant to weathering than sandstone.
Field identification & locations
Look for a sugary quartz texture, strong resistance to scratching, and fracture through grains rather than around them; a steel file should not scratch it. Common worldwide, especially in mountain belts; acid testing is generally unhelpful.
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