metamorphic
Quartzite pebble
Quartzite
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically gray, white, or brownish. Granular texture, glassy to greasy luster, highly durable. This specimen appears water-worn and wet, enhancing its surface sheen.
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Physical properties
Hardness of 7 on the Mohs scale, typically gray, white, or brownish. Granular texture, glassy to greasy luster, highly durable. This specimen appears water-worn and wet, enhancing its surface sheen.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure, causing the quartz grains to recrystallize and fuse together. Often found in riverbeds or beaches where water action rounds the rough edges.
Uses & applications
Commonly used in construction for crushed stone, flooring, roofing, and decorative installations. Also collected by rockhounds as river rocks.
Geological facts
Because quartzite is so hard and resistant to weathering, it often forms ridges and hilltops in mountainous areas.
Field identification & locations
Identified by its granular, sugary texture (though smoothed by water here) and high hardness (scratches glass). Very common in river gravels.
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