metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
Hardness: 7 (Mohs scale); Color: Brownish-red to purple with translucent patches; Luster: Vitrous to dull; Texture: Granular but smooth due to water erosion.
- Hardness
- 7 (Mohs scale)
- Color
- Brownish-red to purple with translucent patches
- Luster
- Vitrous to dull
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Physical properties
Hardness: 7 (Mohs scale); Color: Brownish-red to purple with translucent patches; Luster: Vitrous to dull; Texture: Granular but smooth due to water erosion.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, typically during regional mountain-building events. This specific specimen has been further shaped by fluvial or glacial transport.
Uses & applications
Used as decorative stone in landscaping, ballast, and occasionally as a source of high-purity silica for industrial glass or metal production.
Geological facts
Quartzite is so durable that it often remains as pebbles or hills after surrounding rocks have eroded away. It is harder than steel and will scratch a glass plate easily.
Field identification & locations
Identify by its hardness (cannot be scratched by a knife) and its grainy, crystalline appearance which resembles sugared marble but is much harder. Common in riverbeds and glacial tills.
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