metamorphic
Quartzite Pebble (River Siltstone/Quartzite)
Quartzite (SiO2 composition)
Hardness: 7 on Mohs scale; Color: Tan, beige, brownish-yellow; Luster: Dull to waxy; Texture: Fine-grained, rounded by river erosion; Cleavage: None
- Hardness
- 7 on Mohs scale
- Color
- Tan, beige, brownish-yellow
- Luster
- Dull to waxy
Identified More metamorphic →
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan, beige, brownish-yellow; Luster: Dull to waxy; Texture: Fine-grained, rounded by river erosion; Cleavage: None
Formation & geological history
Formed from sandstone subjected to intense heat and pressure during regional metamorphism, then weathered and naturally rounded by stream or river transport.
Uses & applications
Commonly used in landscaping, river rock decor, aggregate for construction, and casual rock tumbling.
Geological facts
Stream-rounded quartzite pebbles are among the most durable rocks on Earth, easily surviving thousands of years of water transport.
Field identification & locations
Identified by its high hardness (scratches glass), smooth rounded shape, and fine quartz grain texture. Commonly found in riverbeds, lakeshores, and gravel deposits worldwide.
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