metamorphic
Quartzite
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectHardness about 7 Mohs; pale tan, cream, and gray with a dull to glassy luster and interlocking quartz grains. Typically massive, with no distinct cleavage; specific gravity about 2.6–2.7. The photo alone cannot confirm identification.
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Physical properties
Hardness about 7 Mohs; pale tan, cream, and gray with a dull to glassy luster and interlocking quartz grains. Typically massive, with no distinct cleavage; specific gravity about 2.6–2.7. The photo alone cannot confirm identification.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized by heat and pressure, commonly during regional metamorphism. Its age depends on the original sandstone and metamorphic event.
Uses & applications
Used as crushed stone, building and decorative stone, and occasionally for carving or collecting.
Geological facts
Quartzite is generally harder and more resistant to weathering than its sandstone precursor.
Field identification & locations
Look for a hard, quartz-rich rock whose grains are fused; it often breaks across grains rather than around them. Found worldwide in metamorphic terrains; the pictured specimen is not distinctive enough for a firm identification.
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