metamorphic
Quartzite Pebble (or Vein Quartz)
Quartzite / Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: tan, yellowish-brown, honey; Luster: vitreous to waxy; Crystal structure: Trigonal (microcrystalline/interlocking grains); Cleavage: none (conchoidal to uneven fracture); Specific gravity: ~2.65
- Hardness
- 7 on Mohs scale
- Color
- tan, yellowish-brown, honey
- Luster
- vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: tan, yellowish-brown, honey; Luster: vitreous to waxy; Crystal structure: Trigonal (microcrystalline/interlocking grains); Cleavage: none (conchoidal to uneven fracture); Specific gravity: ~2.65
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure during regional or contact metamorphism, followed by surface weathering and fluvial or coastal water-rounding into a smooth pebble.
Uses & applications
Commonly used in landscaping, decorative stone arrangements, construction aggregate, and as tumbling rough for lapidary hobbyists.
Geological facts
Quartzite is so durable and resistant to chemical weathering that quartzite pebbles often survive multiple cycles of erosion, outlasting almost all surrounding rock types over millions of years.
Field identification & locations
Easily identified by its ability to scratch glass or steel knife blades (hardness 7), sugary interlocking texture when viewed closely, and lack of reaction to acid. Abundant along riverbeds, beaches, and gravel deposits worldwide.
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