metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically gray or brown in color with a vitreous to greasy luster, massive crystal structure without visible cleavage, and a specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically gray or brown in color with a vitreous to greasy luster, massive crystal structure without visible cleavage, and a specific gravity around 2.65.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure during regional metamorphism over hundreds of millions of years.
Uses & applications
Used in construction, railroad ballast, decorative landscaping, and as crushed aggregate in road building.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, allowing pebbles to survive long transport in rivers and oceans.
Field identification & locations
Identify by its hardness (scratches glass easily), interlocking quartz grains, and conchoidal fracture. Commonly found in riverbeds and beaches worldwide.
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