metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale; Color: Tan to cream; Luster: Dull to waxy; Texture: Fine-grained, smooth due to water erosion; Cleavage: None
- Hardness
- 7 on Mohs scale
- Color
- Tan to cream
- Luster
- Dull to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan to cream; Luster: Dull to waxy; Texture: Fine-grained, smooth due to water erosion; Cleavage: None
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure. This specific specimen has been further shaped and smoothed by fluvial (river) or coastal water action over millions of years.
Uses & applications
Used in landscaping, construction gravel, aquarium decor, and sometimes as a base material for stone carvings or 'worry stones'.
Geological facts
Quartzite is one of the most durable and weather-resistant rocks on Earth. When sandstone is converted to quartzite, the individual quartz grains recrystallize into a locked mosaic of crystals.
Field identification & locations
Commonly found in riverbeds, glacial deposits, and beaches. Identify in the field by its hardness (it will scratch glass) and its dense, crystalline appearance compared to softer sedimentary rocks.
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