metamorphic
Quartzite (River Pebble)
Quartzite, dominated by Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Tan, beige, or yellowish-white; Luster: Vitreous to dull when waterworn; Crystal structure: Non-foliated, granular; Cleavage: None (conchoidal fracture)
- Hardness
- 7 on Mohs scale
- Color
- Tan, beige, or yellowish-white
- Luster
- Vitreous to dull when waterworn
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan, beige, or yellowish-white; Luster: Vitreous to dull when waterworn; Crystal structure: Non-foliated, granular; Cleavage: None (conchoidal fracture)
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone subjected to extreme heat and pressure. This specific specimen has been further shaped and polished by fluvial (river) erosion.
Uses & applications
Commonly used in landscaping, road construction gravel, and as abrasive material. Due to its hardness, it is also used in countertop manufacturing.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, often forming high ridges or resistant capped peaks in mountain ranges.
Field identification & locations
Identify in the field by its ability to scratch glass and its grainy, sandpaper-like texture that does not rub off. Found ubiquitous in riverbeds and glacial deposits.
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