metamorphic
Quartzite
Quartzite (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: White to off-white/light tan. Luster: Vitreous to sugary/waxy. Crystal Structure: Hexagonal (microcrystalline framework). Cleavage: None (conchoidal to uneven fracture). Specific Gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Color
- White to off-white/light tan
- Luster
- Vitreous to sugary/waxy
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Physical properties
Hardness: 7 on Mohs scale. Color: White to off-white/light tan. Luster: Vitreous to sugary/waxy. Crystal Structure: Hexagonal (microcrystalline framework). Cleavage: None (conchoidal to uneven fracture). Specific Gravity: ~2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure deep within Earth's crust, causing quartz grains to recrystallize and fuse together.
Uses & applications
Used as crushed stone in construction, road ballast, decorative landscaping gravel, dimension stone for countertops and tiles, and as a source of silica in glassmaking.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering. It can be distinguished from marble because quartzite scratches glass easily and will not react or effervesce with dilute acid.
Field identification & locations
Look for a sugary surface texture where individual quartz grains have fused together. Commonly found in mountainous belts and erosion-resistant ridges worldwide. Excellent for beginner rock collections.
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