metamorphic
Quartzite
Metamorphic Quartzite
Hardness of 7 on the Mohs scale, colors ranging from white and gray to pink and orange due to iron oxide impurities, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, no true cleavage, specific gravity of 2.65 to 2.75.
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Physical properties
Hardness of 7 on the Mohs scale, colors ranging from white and gray to pink and orange due to iron oxide impurities, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, no true cleavage, specific gravity of 2.65 to 2.75.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, commonly taking millions of years during mountain-building events.
Uses & applications
Used in construction, as crushed stone for roads, railway ballast, manufacturing of silica bricks, and occasionally as a decorative stone or in countertops.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why ridges formed of quartzite often survive as prominent hills or mountain crests while surrounding rocks erode away.
Field identification & locations
Can be identified in the field by its hard, sugary-textured surface that does not fizz with acid and breaks across the quartz grains rather than around them. Found worldwide.
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