metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale. Color: White to grey with reddish-orange iron staining. Luster: Vitreous to dull. Structure: Granular/crystalline. Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- White to grey with reddish-orange iron staining
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale. Color: White to grey with reddish-orange iron staining. Luster: Vitreous to dull. Structure: Granular/crystalline. Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the metamorphism of quartz sandstone under high heat and pressure. This specific pebble has been smoothed and rounded by water erosion (fluvial or beach processes).
Uses & applications
Commonly used in landscaping, as aggregate in construction, and in glass manufacturing (if high purity). Smooth pebbles are often used in decorative gardening or as pocket stones.
Geological facts
Quartzite is so hard that it will scratch glass. The reddish hues in this specimen are likely caused by iron oxide (lematite or limonite) staining from the surrounding environment.
Field identification & locations
Identify by its hardness (cannot be scratched by a steel knife) and its grainy, sugary texture. Common in riverbeds and ancient glacial deposits worldwide.
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