metamorphic
Quartzite Pebble
Quartzite (primarily Silicon Dioxide, SiO2)
Hardness: 7 on Mohs scale; Color: white to off-white; Luster: vitreous to dull; Crystal structure: hexagonal (microcrystalline); Cleavage: none, conchoidal fracture; Specific gravity: approx. 2.65.
- Hardness
- 7 on Mohs scale
- Color
- white to off-white
- Luster
- vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: white to off-white; Luster: vitreous to dull; Crystal structure: hexagonal (microcrystalline); Cleavage: none, conchoidal fracture; Specific gravity: approx. 2.65.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, typically during mountain-building events. The original sand grains recrystallize into a dense, interlocking mosaic of quartz crystals.
Uses & applications
Used in construction as crushed stone, in glass manufacturing if pure enough, and as decorative river stones or landscaping pebbles.
Geological facts
Quartzite is so tough that it often survives intense weathering better than the rocks around it, resulting in rounded pebbles like this one being found far from their original source. It is often harder than the steel of a knife blade.
Field identification & locations
Identify by its ability to scratch glass and its sugary but dense texture. Common in riverbeds, glacial tills, and mountainous regions. Collectors look for smooth, well-rounded shapes or unique colors caused by mineral inclusions.
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