metamorphic
Quartz Vein Quartzite Pebble
Quartzite with Quartz Veining
Hardness: 7 on the Mohs scale, Color: Tan to brown with white quartz veins, Luster: Vitreous to greasy, Crystal structure: Microcrystalline quartz matrix with crystalline veins, Cleavage: None (fractures conchoidally), Specific Gravity: 2.65
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Physical properties
Hardness: 7 on the Mohs scale, Color: Tan to brown with white quartz veins, Luster: Vitreous to greasy, Crystal structure: Microcrystalline quartz matrix with crystalline veins, Cleavage: None (fractures conchoidally), Specific Gravity: 2.65
Formation & geological history
Formed from quartz-rich sandstone or chert that has undergone intense regional or contact metamorphism, causing quartz grains to recrystallize and fuse. Often subsequently weathered and water-worn into pebbles in stream beds.
Uses & applications
Used primarily in landscaping, decorative gravel, and as a durable aggregate in construction. Common specimen for amateur rock collectors.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why quartz-veined pebbles survive long transport in rivers and streams long after other rocks have eroded away.
Field identification & locations
Found worldwide in riverbeds, glacial tills, and beaches. Easily identified by its high hardness (scratches glass), lack of reaction to acid, and characteristic contrasting white quartz veins.
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