metamorphic
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
Hardness: 7 (Mohs scale); Color: White, tan, or light brown with potential iron staining; Luster: Dull to vitreous; Structure: Massive, granular texture; Specific Gravity: ~2.6-2.7
- Hardness
- 7 (Mohs scale)
- Color
- White, tan, or light brown with potential iron staining
- Luster
- Dull to vitreous
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Physical properties
Hardness: 7 (Mohs scale); Color: White, tan, or light brown with potential iron staining; Luster: Dull to vitreous; Structure: Massive, granular texture; Specific Gravity: ~2.6-2.7
Formation & geological history
Formed when quartz-rich sandstone is subjected to heat, pressure, and chemical activity of metamorphism. This specific specimen has been further shaped and smoothed by fluvial (river) or glacial transport processes.
Uses & applications
Used in construction as a road base, railway ballast, and in decorative landscaping. In industry, high-purity quartzite is a source of silica.
Geological facts
Quartzite is so hard and durable that it often outlasts the surrounding rocks. When a quartzite pebble hits a hard surface, it is known for producing a ringing sound rather than a dull thud.
Field identification & locations
Identify in the field by its hardness (will scratch glass) and its grainy, 'sugar-like' appearance on fresh breaks. Very common in riverbeds and glacial tills globally.
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