metamorphic
Quartzite
Quartzite
AI-generated identification · may be incorrectHardness: 7 (Mohs scale). Color: Typically white, gray, or reddish/brown due to iron oxide impurities. Luster: Vitreous to greasy. Crystal structure: Granular. Cleavage: None. Specific gravity: 2.64-2.69.
- Hardness
- 7 (Mohs scale)
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs scale). Color: Typically white, gray, or reddish/brown due to iron oxide impurities. Luster: Vitreous to greasy. Crystal structure: Granular. Cleavage: None. Specific gravity: 2.64-2.69.
Formation & geological history
Formed by the metamorphism of quartz sandstone. The original quartz sand grains and the silica cement binding them are fused together under intense heat and pressure. Found in mountain ranges and regions that have experienced regional metamorphism.
Uses & applications
Used as decorative stone, crushed stone for road construction, and in the manufacturing of silica bricks, ferrosilicon, and silicon carbide.
Geological facts
Quartzite is highly resistant to chemical weathering and often forms ridges and resistant hilltops in landscapes.
Field identification & locations
Identified by its hardness (scratches glass), granular texture, and often a sugary appearance on broken surfaces. Unlike sandstone, it breaks through the quartz grains rather than around them. Common in areas of ancient orogenic belts.
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