metamorphic
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale; Color: Tan, beige, or off-white; Luster: Dull to vitreous; Crystal structure: Non-foliated granoblastic; Cleavage: None; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Tan, beige, or off-white
- Luster
- Dull to vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan, beige, or off-white; Luster: Dull to vitreous; Crystal structure: Non-foliated granoblastic; Cleavage: None; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, typically during mountain-building events. This specific specimen has been further shaped and smoothed by fluvial erosion in a river environment.
Uses & applications
Used in landscaping, construction aggregates, glass manufacturing, and as decorative stone in gardens.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rock layers during weathering, frequently appearing as the caprock on hills or ridges.
Field identification & locations
Identify by its hardness (will scratch glass) and lack of reaction to acid. Its smooth, rounded oval shape indicates it spent significant time in a high-energy water environment like a riverbed.
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