metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Creamy white to light tan; Luster: Vitreous to waxy when polished; Crystal structure: Non-foliated, interlocking quartz crystals; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Creamy white to light tan
- Luster
- Vitreous to waxy when polished
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Physical properties
Hardness: 7 on Mohs scale; Color: Creamy white to light tan; Luster: Vitreous to waxy when polished; Crystal structure: Non-foliated, interlocking quartz crystals; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. This specific specimen has been further shaped and smoothed into a rounded pebble by high-energy water transport (river or beach erosion).
Uses & applications
Commonly used as decorative landscaping stone, in construction aggregates, or as tumbled stones for hobbyist collections and jewelry.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks in weathering processes. It is harder than a steel knife and will scratch glass easily.
Field identification & locations
Identify in the field by its hardness (will scratch glass) and its sugary, crystalline texture. Found globally in areas of ancient mountain building or in sedimentary deposits like riverbeds.
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