metamorphic
Quartzite
Quartzite
AI-generated identification · may be incorrectHardness: 7 (Mohs scale); Color: Variable, often white, gray, pink, or reddish; Luster: Vitreous; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Variable, often white, gray, pink, or reddish
- Luster
- Vitreous
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Physical properties
Hardness: 7 (Mohs scale); Color: Variable, often white, gray, pink, or reddish; Luster: Vitreous; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Metamorphic rock formed from quartz sandstone subjected to heat and pressure. Commonly found in areas of regional metamorphism.
Uses & applications
Used as a decorative stone, in construction as a building material, for aggregate in road construction, and sometimes in jewelry making when polished.
Geological facts
Quartzite is highly resistant to chemical weathering and often forms prominent ridges and hills. It is harder than the metal of a knife blade.
Field identification & locations
Identified by its hardness, granular texture, and conchoidal fracture. Often found as rounded river rocks or pebbles. Tips for collectors: Look for smooth, rounded stones in riverbeds or beaches.
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