metamorphic
Quartzite (River Stone)
Quartzite (SiO2)
Hardness: 7 (Mohs scale), Color: light grey with dark veins, Luster: vitreous to dull, Crystal Structure: Trigonal, Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 7 (Mohs scale), Color: light grey with dark veins, Luster: vitreous to dull, Crystal Structure: Trigonal, Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz sandstone under high heat and pressure, often found as water-worn pebbles in riverbeds or glacial deposits.
Uses & applications
Primarily used in construction as crushed stone or landscaping gravel, sometimes for small lapidary projects or carvings.
Geological facts
Quartzite is so durable that it often survives intense weathering and transport over hundreds of miles in rivers better than most other rocks.
Field identification & locations
Identify in the field by its hardness (will scratch glass) and lack of reaction to acid. Often found in riverbeds or coastal rocky beaches.
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