metamorphic
Quartzite with Quartz Vein
Metamorphosed Quartz-rich Sandstone (SiO2)
Hardness: 7 on Mohs scale; Color: Greyish-tan matrix with translucent white veins; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal crystals within veins; Granular texture.
- Hardness
- 7 on Mohs scale
- Color
- Greyish-tan matrix with translucent white veins
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Greyish-tan matrix with translucent white veins; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal crystals within veins; Granular texture.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone (orthoquartzite) under high heat and pressure, typically during mountain-building events. The white vein suggests a later hydrothermal stage where silica-rich fluids filled a fracture.
Uses & applications
Mainly used as decorative landscaping stone, construction aggregate, or in road base. Large pure deposits are used for glassmaking or silicon metal production.
Geological facts
Quartzite is so hard that it can scratch steel and is much more durable than the sandstone from which it originated. It often breaks across the quartz grains rather than around them.
Field identification & locations
Identify in the field by its extreme hardness, lack of reaction to acid, and grainy sugar-like texture on unweathered surfaces. Common in glaciated riverbeds and ancient mountain ranges.
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