metamorphic
River Quartzite
Metamorphosed Quartz Sandstone (SiO2)
Hardness: 7 on Mohs scale. Color: Brownish-tan. Luster: Dull to waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.6-2.7.
- Hardness
- 7 on Mohs scale
- Color
- Brownish-tan
- Luster
- Dull to waxy
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Physical properties
Hardness: 7 on Mohs scale. Color: Brownish-tan. Luster: Dull to waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.6-2.7.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. This specimen has been smoothed and rounded by long-term transport in high-energy water environments like rivers or beaches.
Uses & applications
Primarily used as decorative landscaping stone, in construction as aggregate, or as a pocket stone for collectors. High purity quartzite is used to produce glass and silicon.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks in the landscape, eventually forming prominent ridges or rounded river pebbles due to its resistance to chemical weathering.
Field identification & locations
Identify by its hardness (will scratch glass) and its smooth, rounded texture. Commonly found in riverbeds, glacial tills, and along coastlines globally.
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