metamorphic
Quartzite Pebble
Quartzite (mostly SiO2)
Hardness: 7 on Mohs scale; Color: Greyish-white with iron staining (red/orange); Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7.
- Hardness
- 7 on Mohs scale
- Color
- Greyish-white with iron staining (red/orange)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Greyish-white with iron staining (red/orange); Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. High heat and pressure causes recrystallization of the quartz grains. This specific specimen has been rounded by fluvial or glacial transport.
Uses & applications
Used in construction as a decorative stone, road ballast, or as a source of silica for glass manufacturing and metallurgy. Small pebbles are often used in landscaping.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rock in weathering processes. It is harder than steel and will easily scratch glass.
Field identification & locations
Identify in the field by its extreme hardness and grainy texture that has been fused. Look for it in riverbeds or glacial tills. It is one of the most common materials found in gravel deposits.
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