metamorphic
Quartzite Pebble (Beach Pebble)
Metamorphic Quartzite (SiO2)
Hardness: 7 on the Mohs scale; Color: Grayish-brown to translucent tan with fine fracture patterns; Luster: Vitreous to waxy when wet; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on the Mohs scale
- Color
- Grayish-brown to translucent tan with fine fracture patterns
- Luster
- Vitreous to waxy when wet
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Physical properties
Hardness: 7 on the Mohs scale; Color: Grayish-brown to translucent tan with fine fracture patterns; Luster: Vitreous to waxy when wet; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone subjected to high temperature and pressure. The pebble shape is the result of continuous mechanical erosion and rounding by stream, river, or wave action along coastal shores.
Uses & applications
Commonly used as decorative landscaping stones, aquarium gravel, construction aggregate, and as hand-held beach stones for tumbling and collecting.
Geological facts
Beach-worn quartzite pebbles are extremely durable because quartzite consists almost entirely of interlocking quartz grains, making it resistant to chemical weathering and physical abrasion.
Field identification & locations
Identified by its high hardness (scratches glass easily), smooth water-worn surface, and microcrystalline sugary texture visible under magnification. Found along riverbeds, gravel bars, and ocean beaches worldwide.
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