metamorphic
Quartzite with Quartz Veining
Metamorphosed Quartz-rich Sandstone (SiO2)
Hardness: 7 on Mohs scale; Color: Grayish-tan with white veins; Luster: Vitreous/Dull; Texture: Granular and crystalline; Breakage: Conchoidal to irregular.
- Hardness
- 7 on Mohs scale
- Color
- Grayish-tan with white veins
- Luster
- Vitreous/Dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Grayish-tan with white veins; Luster: Vitreous/Dull; Texture: Granular and crystalline; Breakage: Conchoidal to irregular.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. High heat and pressure cause quartz grains to recrystallize and fuse together. The white veins represent later hydrothermal quartz deposits filling fractures.
Uses & applications
Used primarily as construction aggregate, crushed stone for road beds, and occasionally for decorative landscaping or lapidary tumbling.
Geological facts
Quartzite is so tough that it usually breaks through the quartz grains rather than around them, unlike sandstone. It is extremely resistant to chemical weathering.
Field identification & locations
Identify by its ability to scratch glass and its granular, sugary appearance. Commonly found in mountain belts and glacial till. Collectors look for unique patterns or 'wishing stone' bands.
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