metamorphic
Quartzite with Iron Oxide
Quartzite
AI-generated identification · may be incorrectHardness: 7 (Mohs scale); Color: Reddish-brown, pink, or gray due to iron impurities; Luster: Vitreous to dull; Crystal structure: Massive, granular; Cleavage: None; Specific gravity: 2.65-2.80
- Hardness
- 7 (Mohs scale)
- Color
- Reddish-brown, pink, or gray due to iron impurities
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Mohs scale); Color: Reddish-brown, pink, or gray due to iron impurities; Luster: Vitreous to dull; Crystal structure: Massive, granular; Cleavage: None; Specific gravity: 2.65-2.80
Formation & geological history
Formed from the metamorphism of sandstone under high heat and pressure, typically in tectonic convergence zones. The red/brown coloration is due to iron oxide staining or inclusions.
Uses & applications
Used in construction as crushed stone, dimension stone, or decorative aggregate. Also collected as a lapidary material for tumbling.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming ridges and mountain peaks.
Field identification & locations
Identify by its hardness (scratches glass), granular texture (sugary appearance on fresh breaks), and lack of cleavage. Common in many mountainous and formerly glaciated regions as river cobbles.
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