metamorphic
Quartzite
Quartzite
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to grey but can be shades of pink, red, or purple due to impurities. Glassy luster. Granular, interlocking quartz crystals. No cleavage. Specific gravity of 2.6-2.8.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to grey but can be shades of pink, red, or purple due to impurities. Glassy luster. Granular, interlocking quartz crystals. No cleavage. Specific gravity of 2.6-2.8.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. Heat and pressure recrystallize the sand grains and the silica cement that binds them together. Can be found in areas of past tectonic activity.
Uses & applications
Used in construction as crushed stone for roadbeds and railway ballast. Sometimes used for countertops or decorative stone. Also used in the production of silica for glassmaking and industrial applications.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent ridges and peaks in mountainous regions.
Field identification & locations
Identify by its hardness (scratches glass), granular texture, and lack of fizz when tested with dilute hydrochloric acid. Commonly found in metamorphic terrains worldwide.
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