metamorphic
Quartzite Pebble
Metamorphic Quartzite
AI-generated identification · may be incorrectHardness 7 on Mohs scale, grayish-purple color, vitreous luster, non-foliated massive crystal structure, specific gravity around 2.65.
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Physical properties
Hardness 7 on Mohs scale, grayish-purple color, vitreous luster, non-foliated massive crystal structure, specific gravity around 2.65.
Formation & geological history
Formed through the thermal or regional metamorphism of quartz-rich sandstone under high temperature and pressure, typically over hundreds of millions of years.
Uses & applications
Used in landscaping, decorative gravel, railroad ballast, and occasionally for specialized construction materials due to its exceptional durability.
Geological facts
Quartzite is extremely resistant to weathering, which explains why quartz-rich rocks survive long river journeys to become smooth, rounded pebbles.
Field identification & locations
Identified by its inability to be scratched by steel and lack of reaction to acid; commonly found in riverbeds, glacial deposits, and ancient beaches worldwide.
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