metamorphic
Quartzite
Quartzite
Hard, non-foliated, mostly composed of quartz grains. Colors can be white, gray, reddish, or pinkish depending on impurities. Luster is typically vitreous to granular.
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Physical properties
Hard, non-foliated, mostly composed of quartz grains. Colors can be white, gray, reddish, or pinkish depending on impurities. Luster is typically vitreous to granular.
Formation & geological history
Formed by metamorphism of sandstone. The original quartz grains and quartz cement recrystallize under high heat and pressure, fusing together into a dense, hard rock.
Uses & applications
Used historically for stone tools, currently used as crushed stone in construction, railroad ballast, and decorative stone.
Geological facts
Quartzite is so hard that it breaks across the quartz grains rather than around them, distinguishing it from sandstone.
Field identification & locations
Identify by its hardness (scratches glass) and granular texture. Commonly found in areas of past mountain building.
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