metamorphic
Quartz-rich stone fragment (probable quartzite or chert)
Quartzite, composed predominantly of SiO₂; exact identification is uncertain from the image
AI-generated identification · may be incorrectSmall pale gray-white, angular fragment with a dull to weakly vitreous luster and granular texture. Quartz has Mohs hardness 7, no cleavage, and quartzite typically has specific gravity around 2.65; the specimen appears weathered or dusty.
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Physical properties
Small pale gray-white, angular fragment with a dull to weakly vitreous luster and granular texture. Quartz has Mohs hardness 7, no cleavage, and quartzite typically has specific gravity around 2.65; the specimen appears weathered or dusty.
Formation & geological history
If quartzite, it formed when quartz-rich sandstone was recrystallized during metamorphism, commonly during mountain-building; age depends on its source formation. A sedimentary chert alternative would form from microcrystalline silica in marine sediments.
Uses & applications
Quartzite is used as crushed stone, aggregate, building stone, and occasionally as a decorative material; small fragments have modest collecting value.
Geological facts
The image is insufficient for confident discrimination between quartzite, chert, and an ordinary quartz-rich construction fragment.
Field identification & locations
Look for glassy quartz grains fused into a hard mass, no acid reaction, and the ability to scratch glass; chert is usually smoother and waxier. Common worldwide, especially in metamorphic belts and sandstone-derived terrains.
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