metamorphic
Quartzite
Metamorphic Quartz Sandstone
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, pale yellowish-brown color, vitreous to greasy luster, massive crystal structure with no distinct cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on Mohs scale, pale yellowish-brown color, vitreous to greasy luster, massive crystal structure with no distinct cleavage, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically during mountain-building events over millions of years.
Uses & applications
Used in construction, railway ballast, manufacturing of silica bricks, and occasionally as decorative stone or countertops.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming prominent ridges and mountain peaks because it resists erosion better than surrounding rocks.
Field identification & locations
Commonly found in glacial tills and river gravels throughout Illinois, identified by its ability to scratch glass and lack of reaction to acid.
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