metamorphic
Quartzite pebble with Quartz vein
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Tan, beige, and white; Luster: Vitreous to waxy; Texture: Granular and crystalline; Non-foliated structure; High specific gravity (approx. 2.65).
- Hardness
- 7 on Mohs scale
- Color
- Tan, beige, and white
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan, beige, and white; Luster: Vitreous to waxy; Texture: Granular and crystalline; Non-foliated structure; High specific gravity (approx. 2.65).
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, causing sand grains to recrystallize. This specimen likely weathered into a river pebble over millions of years.
Uses & applications
Used primarily as construction aggregate, railway ballast, and in some decorative landscaping. Pure quartzite is also a source of silica for glass making.
Geological facts
Quartzite is so tough that it often survives intense weathering and erosion better than the surrounding rocks, which is why it is frequently found as rounded river stones or 'cobbles'.
Field identification & locations
Identify by its ability to scratch glass and its granular, sugary appearance on broken surfaces. Found commonly in riverbeds, glacial deposits, and mountain ranges globally.
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