metamorphic
Quartzite Pebble
Quartzite (SiO2 based)
Hardness: 7 on Mohs scale; Color: Pinkish-orange to tan due to iron oxide staining; Luster: Dull to slightly vitreous; Texture: Granular, sugary appearance; Specific gravity: approx 2.65
- Hardness
- 7 on Mohs scale
- Color
- Pinkish-orange to tan due to iron oxide staining
- Luster
- Dull to slightly vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: Pinkish-orange to tan due to iron oxide staining; Luster: Dull to slightly vitreous; Texture: Granular, sugary appearance; Specific gravity: approx 2.65
Formation & geological history
Formed from the metamorphism of quartz sandstone under high heat and pressure. The original quartz grains recrystallize into a dense interlocking mosaic.
Uses & applications
Used as construction aggregate, high-quality road stone, and decorative landscaping stone. Historically used for making stone tools.
Geological facts
Quartzite is one of the most durable and weather-resistant rocks on Earth. This specific specimen has been rounded and smoothed by water erosion, likely in a river or beach environment.
Field identification & locations
Identifiable by its inability to be scratched by a steel knife and its lack of reaction to acid. Often found as rounded pebbles in gravel pits or riverbeds.
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