metamorphic
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale; Color: Tan to light brown; Luster: Dull to waxy; Crystal structure: Non-foliated granoblastic; Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Tan to light brown
- Luster
- Dull to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan to light brown; Luster: Dull to waxy; Crystal structure: Non-foliated granoblastic; Specific gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, often found in ancient marine or fluvial deposits and smoothed by water erosion.
Uses & applications
Used in construction as a sturdy aggregate, high-purity varieties are used in glass making and ceramics, or as decorative landscaping stones.
Geological facts
Quartzite is so durable that it can survive long-term erosion and weathering that destroys other rocks, often resulting in smooth, rounded river cobbles and beach pebbles.
Field identification & locations
Identify by its ability to scratch glass and its lack of visible grains (unlike original sandstone). Frequently found in riverbeds, glacial tills, and along coastlines.
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