metamorphic
Quartzite with Quartz Vein
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, predominantly white to grey in color with a vitreous to greasy luster, massive crystal structure, and lacks distinct cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, predominantly white to grey in color with a vitreous to greasy luster, massive crystal structure, and lacks distinct cleavage.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically in tectonic orogenic belts over millions of years.
Uses & applications
Used primarily in construction, crushed stone for roads, railroad ballast, and decorative landscaping due to its extreme durability.
Geological facts
Quartzite is extremely resistant to weathering and often forms prominent ridges and hills in the landscape because it erodes much slower than surrounding rocks.
Field identification & locations
Can be identified in the field by its sugary texture on broken surfaces, high hardness that easily scratches glass, and the presence of quartz veins running through it.
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