sedimentary
Quartzite Pebbles or River Rock
Quartzite / Microcrystalline Quartz (SiO2)
Hardness: 7 on Mohs scale; Color: Tan, beige, grey; Luster: Dull to waxy; Structure: Finely crystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: Approx 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Tan, beige, grey
- Luster
- Dull to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan, beige, grey; Luster: Dull to waxy; Structure: Finely crystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: Approx 2.65.
Formation & geological history
Formed through the weathering and erosion of quartz-rich parent rocks, subsequently rounded by water transport in riverbeds or coastal environments. Often millions of years old.
Uses & applications
Landscaping, aquarium decor, construction aggregate, and occasionally used as abrasive media.
Geological facts
River rocks undergo natural tumbling for thousands of years, resulting in their smooth, rounded shape. They are often used as 'worry stones' due to their tactile smoothness.
Field identification & locations
Identify in the field by its rounded shape, hardness (it will scratch glass), and location in or near waterways. Very common globally in riverbeds.
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